Disco

On the disco goes 12 boys and 15 girls. In how many ways can we select four dancing couples?

Correct answer:

n =  16216200

Step-by-step explanation:

$n=(12\cdot 11\cdot 10\cdot 9)\cdot (15\cdot 14\cdot 13\cdot 12)\mathrm{/}(4\cdot 3\cdot 2\cdot 1)=16216200$

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