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

User Bobsoap
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1 Answer

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

User Cesar Loachamin
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