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I'm not sure what this is exactly?
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4 votes
I'm not sure what this is exactly?

I'm not sure what this is exactly?-example-1
User Tos
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2 Answers

4 votes

\bf _nC_r=\cfrac{n!}{r!(n-r)!}\\\\\\ _(100)C_2=\cfrac{100!}{2!(100-2)!}\qquad\qquad _(100)C_(98)=\cfrac{100!}{98!(100-98)!}
User Rtome
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8.1k points
5 votes

_nC_k=_nC_(n-k)

so

_(100)C_(98)=_(100)C_(100-98)=_(100)C_2=4,950
User Henfiber
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