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Prove that among any 3 integers there are always two whose difference is divisible by 2.

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    Can you show some effort, i.e. what ides have you tried so far?2012-11-13
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    Related: http://math.stackexchange.com/questions/236235/discrete-math-counting/236236#2362362012-11-13
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    Not if 2 or more of them can be the same!2013-04-05

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