Medals

In how many ways can be divided gold, silver and bronze medal among 21 contestant?

Correct result:

n =  7980

Solution:

n=21⋅(21−1)⋅(21−2)=21⋅20⋅19=7980n = 21\cdot (21-1)\cdot (21-2) = 21 \cdot 20 \cdot 19 = 7980

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