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## #1 2005-09-23 07:16:06

robin
Member
Registered: 2005-09-23
Posts: 3

### How did Fermat do it ?

Hi,

You have probably all seen or read about Fermat receiving a letter asking if 100895598169 is prime and quickly replying that it was a factor of 112303 and 898423.
Anyway, I was trying to find out how he worked it out. Knowing the answers gives a huge help in finding a method, but don't think he did it the same way.

100895598169 X 8 = 807164785352
Sqrt of 807164785352 =  898423
100895598169 / 898423 = 112303

Can anyone come up with other methods ?

Robin

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## #2 2005-09-25 19:35:08

kweyers59@aol.com
Member
Registered: 2005-09-25
Posts: 2

### Re: How did Fermat do it ?

Help... a problem in combinatorics..

stadndard 52 card deck - 5 cards being dealt.. what is the probability to have at least 3 non-paired cards under 9??

Santa in Florida, USA  kweyers59@aol.com

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