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frac{(2n)!}{(1.3.5….(2n-1))n!} =...

`frac{(2n)!}{(1.3.5….(2n-1))n!} = `

A

`A.2^(n-1)`

B

`B.(2n)!`

C

`C.2n`

D

`D.2^n`

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