Two numbers and are chosen from the set . Find the probability that is divisible by .

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- Sep 27th 2008, 05:38 PMpankajClassical definition of probability
Two numbers and are chosen from the set . Find the probability that is divisible by .

- Sep 28th 2008, 02:07 AMMoo
Hello,

Note that with has a remainder 1 in the division by 5.

Therefore, none of these numbers would be such that is divisible by 5.

Remain the multiples of 5. There are n of them in the set. How many ways are there to choose 2 objects randomly among n ? (with replacement)