Disco

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

Correct result:

n =  16216200

Solution:

n=(12⋅ 11⋅ 10⋅ 9)⋅ (15⋅ 14⋅ 13⋅ 12)/(4⋅ 3⋅ 2⋅ 1)=16216200=1.621620⋅107

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