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  • 25-11-2016
  • Mathematics
contestada

nCn is __________ equal to 1.
always
sometimes
never

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Аноним Аноним
  • 25-11-2016
NCn is always equal to 1. 
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Аноним Аноним
  • 26-11-2016
The third is either A or B, depending on your assumptions. Most likely the "correct" answer is A, but I would argue it's B, since (-1)C(-1) is not equal to 1 (it's not defined).

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