DerryDelaney
DerryDelaney DerryDelaney
  • 12-11-2016
  • Mathematics
contestada

n is a positive integer.
Explain why n(n-1) must be an even number.

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katie6wpg katie6wpg
  • 12-11-2016
If N is a positive integer, it must be either even or odd. If N is odd, then N-1 will be even. If N is even, then N-1 will be odd. Either way, when you multiply n and n-1, one of those expressions is going to be an even number, and any number multiplied by an even number is an even number. Hope this helps! :)
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