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Prove that x^2- x is divisible by 2 fore all the positive integer x |
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Answer» Step-by-step EXPLANATION: this is probably not the book PROOF but it's a LOGICAL proof x^2-x = x(x-1) now if x is odd in x(x-1), x-1 would be EVEN or 0 and therefore divisible by 2 if x is even then in x(x+1) we get x as even which implies it is divisible by two |
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