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Mathematics

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How many different combinations of two can be made from 80 people?

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Ultroid Ultroid

Today at 10:56 PM

Plugging directly into the combination formula, the answer is [tex]\binom{80}{2}=\frac{80!}{2!78!}=\frac{80\cdot 79}{2\cdot 1}=40\cdot 79=\boxed{3160},[/tex] where we have cancelled out common factors.

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