Can you find the divisor??

Find the largest prime number p p such that when each of the three numbers 29787, 31339, 33861 are divided by p p , we get the same remainder.


The answer is 97.

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1 solution

Krishna Ar
Aug 26, 2014

This problem has a very easy solution. Since we have all three numbers leaving same remainder say k k when divided by the number p p each of the differences of any two numbers is divisible by p p . Thus we get 1552 ( 31339 29787 ) , 2522 ( 33861 31339 ) , 4074 ( 33861 29787 ) 1552(31339-29787), 2522(33861-31339), 4074(33861-29787) all are divisble by p p . On factorizing, we find that the largest "COMMON" prime factor of theirs is 97 97 Kindly upvote if you liked this!

great solution

Shib Shankar Sikder - 5 years, 11 months ago

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Thank you !

Krishna Ar - 5 years, 11 months ago

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I answered first by writing a Matlab code!

Shib Shankar Sikder - 5 years, 11 months ago

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@Shib Shankar Sikder Bash FTW :D

Krishna Ar - 5 years, 11 months ago

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