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(3!)!/(3!*3!) = 20, where n! = 1*2*...*n is n-factorial

Proof :

3! =1*2*3=6, (3!)!=6!=1*2*3*4*5*6=720, therefore : (3!)!/(3!*3!) = 720/6*6 =720/36 = 20

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12y ago
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Q: Can you make 20 out of three 3s?
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