I have no idea how to approach this problem, please help.

vlad

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- December 14th 2013, 12:55 AMplstevensIntegers prime numbers
I have no idea how to approach this problem, please help.

vlad - December 14th 2013, 01:01 AMromsekRe: Integers prime numbers
9 and 10 have no common factors. so if m/10 is an integer and m/9 is an integer then m/90 is an integer and m=90k for some k. 5 divides 90 so m/5 is an integer.

- December 14th 2013, 01:21 AMplstevensRe: Integers prime numbers
thanks, your solution works like a charm everytime. I'm so grateful

- January 2nd 2014, 08:25 PMHallsofIvyRe: Integers prime numbers
In fact, 5 divides 10 so "m/10 is an integer" is enough to say that "m/5 is an integer". "m/9 is an integer" is unnecessary.

(An this problem has nothing to do with "prime numbers".)