Graduation party

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

Correct answer:

n =  16216200

Step-by-step explanation:

$n=15\cdot 14\cdot 13\cdot 12\cdot (12\cdot 11\cdot 10\cdot 9)\mathrm{/}4!=16216200$

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