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19 May 2013
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#61
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Correct, John. That was too easy  .
X = 2 + ½X = 4
3 * 4 = 12
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My System Specs |
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Computer type Laptop
System Manufacturer/Model Number HP ENVY 17-1150eg
OS Windows 10 Pro x64 EN-GB
CPU 1.6 GHz Intel Core i7-720QM Processor
Memory 6 GB
Graphics Card ATI Mobility Radeon HD 5850 Graphics
Sound Card Beats sound system with integrated subwoofer
Monitor(s) Displays 17" laptop display, 22" LED and 32" Full HD TV through HDMI
Screen Resolution 1600*900 (1), 1920*1080 (2&3)
Keyboard Logitech diNovo Media Desktop Laser (bluetooth)
Mouse Logitech Performance Mouse MX
Cooling As Envy runs a bit warm, I have it on a Cooler Master pad
Hard Drives Internal: 2 x 500 GB SATA Hard Disk Drive 7200 rpm
External: 2TB for backups, 3TB USB3 network drive for media
Internet Speed 50/10 Mbps VDSL
Antivirus Windows Defender 4.3.9431.0
Browser Maxthon 3.5.2., IE11
Computer type PC/Desktop
System Manufacturer/Model Number Gigabyte Technology Co. Ltd.
OS Windows 10 Pro 64-Bit
CPU Intel(R) Core(TM) i5-4460 CPU @ 3.20 GHz(4CPU's), ~3.2GHz
Motherboard Gigabyte B85M-HD3-A
Memory 8192 RAM
Graphics Card NVIDIA GeForce 710
Sound Card Integrated High Definition audio with Realtek ALC888 codec
Monitor(s) Displays Acer V183HV Ab 18.5" LCD Display
Screen Resolution 1366 x 768
Keyboard HP
Mouse HP
Internet Speed 100mbps
Antivirus Microsoft Security Essentials
Browser Chrome, Firefox
19 May 2013
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#63
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Quote: Originally Posted by Kari
Correct, John. That was too easy  .
X = 2 + ½X = 4
3 * 4 = 12
I thought it was a trick question...
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My System Specs |
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Computer type PC/Desktop
System Manufacturer/Model Number Gigabyte Technology Co. Ltd.
OS Windows 10 Pro 64-Bit
CPU Intel(R) Core(TM) i5-4460 CPU @ 3.20 GHz(4CPU's), ~3.2GHz
Motherboard Gigabyte B85M-HD3-A
Memory 8192 RAM
Graphics Card NVIDIA GeForce 710
Sound Card Integrated High Definition audio with Realtek ALC888 codec
Monitor(s) Displays Acer V183HV Ab 18.5" LCD Display
Screen Resolution 1366 x 768
Keyboard HP
Mouse HP
Internet Speed 100mbps
Antivirus Microsoft Security Essentials
Browser Chrome, Firefox
19 May 2013
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#64
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NExt one, a bit more difficult but still doable. As this is widely used in teaching statistics and probabilities, the answer can be easily found around the interwebs but try to figure this out by yourself before searching the answer.
A group of people. How big must the group be to be absolutely 100% sure at least two persons in the group have the same birthday, are born on the same day and month for instance one in April 14th 1970 and another the same April 14th 1967?
How big must the group be that probability to find two people with same birthday is 99%?
How big must the group be that probability to find two people with same birthday is 50%?
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My System Specs |
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Computer type Laptop
System Manufacturer/Model Number HP ENVY 17-1150eg
OS Windows 10 Pro x64 EN-GB
CPU 1.6 GHz Intel Core i7-720QM Processor
Memory 6 GB
Graphics Card ATI Mobility Radeon HD 5850 Graphics
Sound Card Beats sound system with integrated subwoofer
Monitor(s) Displays 17" laptop display, 22" LED and 32" Full HD TV through HDMI
Screen Resolution 1600*900 (1), 1920*1080 (2&3)
Keyboard Logitech diNovo Media Desktop Laser (bluetooth)
Mouse Logitech Performance Mouse MX
Cooling As Envy runs a bit warm, I have it on a Cooler Master pad
Hard Drives Internal: 2 x 500 GB SATA Hard Disk Drive 7200 rpm
External: 2TB for backups, 3TB USB3 network drive for media
Internet Speed 50/10 Mbps VDSL
Antivirus Windows Defender 4.3.9431.0
Browser Maxthon 3.5.2., IE11
19 May 2013
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#65
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Quote: Originally Posted by Kari
NExt one, a bit more difficult but still doable. As this is widely used in teaching statistics and probabilities, the answer can be easily found around the interwebs but try to figure this out by yourself before searching the answer.
A group of people. How big must the group be to be absolutely 100% sure at least two persons in the group have the same birthday, are born on the same day and month for instance one in April 14th 1970 and another the same April 14th 1967?
How big must the group be that probability to find two people with same birthday is 99%?
How big must the group be that probability to find two people with same birthday is 50%?
I know it's 23 people for 50% and I seem to recall that 99% is achieved at around the 50 mark but my calculator can't handle calculations larger than 365^39 so I haven't got a hope in hell of working that one out!
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My System Specs |
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Computer type PC/Desktop
System Manufacturer/Model Number Build #1
OS Windows 8.1 Pro x64
CPU Intel i7 3770K @4.5GHz
Motherboard ASUS P8Z77-V PRO
Memory Corsair Vengeance 2x4GB DDR3 1600MHz Low Profile (White)
Graphics Card Gigabyte Radeon HD 7850 (2GB GDDR5)
Sound Card Integrated on motherboard
Monitor(s) Displays 23" LG LCD/LED IPS
Screen Resolution 1920*1080
Keyboard Microsoft Desktop 2000 Wireless Keyboard
Mouse Microsoft Desktop 2000 Wireless Mouse
PSU Corsair TX650W V2 (80+ Bronze)
Case NZXT Phantom 410 White
Cooling Corsair H100 Water Cooler
Hard Drives Samsung EVO 128GB SSD
Seagate Barracuda 2GB 7200rpm
2x Seagate FreeAgent [500gb]
Internet Speed 95 Mb/s Download 70 Mb/s Upload
Antivirus MSE + MBAM Pro
Browser Firefox
19 May 2013
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#66
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Well it's got to be 367 for 100% certainty (in a leap year)
The other two I will have a go at later after taking my dog for a walk (Never know might meet Carl)
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My System Specs |
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Computer type PC/Desktop
OS Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
CPU Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
Motherboard ASUSTeK COMPUTER INC. P8H77-M
Memory 8.00 GB
Graphics Card Intel(R) HD Graphics 4000
Sound Card On Board
Monitor(s) Displays Dell 24"
Screen Resolution 1920 x 1080
Keyboard Logitech MK300
Mouse Logitech WOM
PSU 500w Corsair
Case Cooler Master
Cooling 3 Fans
Hard Drives (1) INTEL SSDSC2CT180A3 ATA Device (2) ST500DM002-1BD142 ATA Device (3) WDC WD3200AAKS-75L9A0 ATA Device (4) Generic- Compact Flash USB Device (5) Generic- MS/MS-Pro USB Device (6) Generic- SD/MMC USB Device (7) Generic- SM/xD-Picture USB
Internet Speed 75Mb
Antivirus Norton 360
Browser Firefox, Opera, IE
19 May 2013
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#67
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Correct, Tom and John.
In probability theory this is known as the Birthday problem.
Due leap years, 100% probability needs 367 people, but surprisingly the 99% probability only needs 57 people, and 50% probability only 23 people.
It is an interesting example of probability theory, how statistics work.
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My System Specs |
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Computer type Laptop
System Manufacturer/Model Number HP ENVY 17-1150eg
OS Windows 10 Pro x64 EN-GB
CPU 1.6 GHz Intel Core i7-720QM Processor
Memory 6 GB
Graphics Card ATI Mobility Radeon HD 5850 Graphics
Sound Card Beats sound system with integrated subwoofer
Monitor(s) Displays 17" laptop display, 22" LED and 32" Full HD TV through HDMI
Screen Resolution 1600*900 (1), 1920*1080 (2&3)
Keyboard Logitech diNovo Media Desktop Laser (bluetooth)
Mouse Logitech Performance Mouse MX
Cooling As Envy runs a bit warm, I have it on a Cooler Master pad
Hard Drives Internal: 2 x 500 GB SATA Hard Disk Drive 7200 rpm
External: 2TB for backups, 3TB USB3 network drive for media
Internet Speed 50/10 Mbps VDSL
Antivirus Windows Defender 4.3.9431.0
Browser Maxthon 3.5.2., IE11
19 May 2013
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#68
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Quote: Originally Posted by Kari
Correct, Tom and John.
In probability theory this is known as the Birthday problem.
Due leap years, 100% probability needs 367 people, but surprisingly the 99% probability only needs 57 people, and 50% probability only 23 people.
It is an interesting example of probability theory, how statistics work.
For those of you who remember the Flame malware that came to light last year, this is the main theory behing the MD5 collision attack that gave Flame a, what seemed to be, legitimate digital signature:
http://www.trailofbits.com/resources/flame-md5.pdf
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My System Specs |
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Computer type PC/Desktop
System Manufacturer/Model Number Build #1
OS Windows 8.1 Pro x64
CPU Intel i7 3770K @4.5GHz
Motherboard ASUS P8Z77-V PRO
Memory Corsair Vengeance 2x4GB DDR3 1600MHz Low Profile (White)
Graphics Card Gigabyte Radeon HD 7850 (2GB GDDR5)
Sound Card Integrated on motherboard
Monitor(s) Displays 23" LG LCD/LED IPS
Screen Resolution 1920*1080
Keyboard Microsoft Desktop 2000 Wireless Keyboard
Mouse Microsoft Desktop 2000 Wireless Mouse
PSU Corsair TX650W V2 (80+ Bronze)
Case NZXT Phantom 410 White
Cooling Corsair H100 Water Cooler
Hard Drives Samsung EVO 128GB SSD
Seagate Barracuda 2GB 7200rpm
2x Seagate FreeAgent [500gb]
Internet Speed 95 Mb/s Download 70 Mb/s Upload
Antivirus MSE + MBAM Pro
Browser Firefox
19 May 2013
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#69
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Quote: Originally Posted by tom982

Quote: Originally Posted by Kari
Correct, Tom and John.
In probability theory this is known as the Birthday problem.
Due leap years, 100% probability needs 367 people, but surprisingly the 99% probability only needs 57 people, and 50% probability only 23 people.
It is an interesting example of probability theory, how statistics work.
For those of you who remember the Flame malware that came to light last year, this is the main theory behing the MD5 collision attack that gave Flame a, what seemed to be, legitimate digital signature:
http://www.trailofbits.com/resources/flame-md5.pdf
This is also an interesting read: Birthday attack - Wikipedia, the free encyclopedia
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My System Specs |
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Computer type Laptop
System Manufacturer/Model Number HP ENVY 17-1150eg
OS Windows 10 Pro x64 EN-GB
CPU 1.6 GHz Intel Core i7-720QM Processor
Memory 6 GB
Graphics Card ATI Mobility Radeon HD 5850 Graphics
Sound Card Beats sound system with integrated subwoofer
Monitor(s) Displays 17" laptop display, 22" LED and 32" Full HD TV through HDMI
Screen Resolution 1600*900 (1), 1920*1080 (2&3)
Keyboard Logitech diNovo Media Desktop Laser (bluetooth)
Mouse Logitech Performance Mouse MX
Cooling As Envy runs a bit warm, I have it on a Cooler Master pad
Hard Drives Internal: 2 x 500 GB SATA Hard Disk Drive 7200 rpm
External: 2TB for backups, 3TB USB3 network drive for media
Internet Speed 50/10 Mbps VDSL
Antivirus Windows Defender 4.3.9431.0
Browser Maxthon 3.5.2., IE11
19 May 2013
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#70
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I'm still trying to figure out the bricks.
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My System Specs |
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Computer type PC/Desktop
System Manufacturer/Model Number Home Built Desktop By DataTech
OS Windows 7 Ultimate X64 SP1
CPU Intel i5-2550K, Differing ~4.4-4.8GHz No built in GPU
Motherboard ASUS P8Z68-V PRO/GEN3
Memory 16GB G.Skill Sniper 1866MHz @ 2133MHz 2x8GB
Graphics Card ASUS GTX650TIB-DC2OC-2GD5, (650TI Boost)
Sound Card Onboard Realtek 5-1
Monitor(s) Displays Samsung P2570HD
Screen Resolution 1920x1080
Keyboard E-Z Eyes, bright yellow keys with large characters
Mouse steelseries SENSEI Laser Pro Gaming
PSU Corsair HX650W
Case Inwin Dragon Rider
Cooling Hyper 212 EVO w/two Noctua fans, push-pull, @1300 RPM
Hard Drives Samsung 840 Pro 256GB SSD for OS, 500GB Seagate Constellation (Enterprise drive) for Data
Internet Speed 48-51Mbs Mbs down, 11 Mbs up Xfinity Cable
Antivirus Norton Internet Security 2013
Browser IE 10, Opera, Pale Moon if needed
Other Info 4 case fans, LG BluRay-RE, ASUS DVD-RW, Mr. Fusion power supply, 1.21 gigawatts.
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