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- Sep 4th 2012, 01:42 PM #1

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- Sep 2012
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- missouri
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## need soluion for this..help me as soon as possible

how to prove:

let n=p1^r1.p2^r2.p3^r3...pk^rk where p1,p2,..pk are distinct primes and each ri>=0. prove that n is a perfect square if and only if each ri is even.