Graduation party

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

Correct result:

n =  16216200

Solution:

n=15⋅ 14⋅ 13⋅ 12⋅ (12⋅ 11⋅ 10⋅ 9)/4!=16216200

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