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Question Number 63561 by aliesam last updated on 05/Jul/19

Answered by MJS last updated on 05/Jul/19

$$=\underset{k=1}{\prod ^n}(2k-1)\times \underset{k=1}{\prod ^n}2k=$$$$=[1\times 3\times 5\times ...\times (2n-1)]\times [2\times 4\times 6\times ...\times 2n]=$$$$=1\times 2\times 3\times 4\times ...\times (2n-1)\left(2n\right)=$$$$=\left(2n\right)!$$

Commented by aliesam last updated on 05/Jul/19

$$godblessyousir$$

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