Graduation party

There are 15 boys and 12 girls at the graduation party. Determine how many four couples can be selected.


n =  16216200


n=15 14 13 12 (12 11 10 9)/4!=16216200=1.621620107n=15 \cdot \ 14 \cdot \ 13 \cdot \ 12 \cdot \ (12 \cdot \ 11 \cdot \ 10 \cdot \ 9)/4!=16216200=1.621620\cdot 10^{ 7 }

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