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How many two person can be picked out of a group of 7

How many two person can be picked out of a group of 7
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How many two person can be picked out of a group of 7

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User SKwa
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1 Answer

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{7 \choose 2}=(7!)/(2!5!)=(6\cdot5)/(2)=3\cdot5=15
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User Helvio
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