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If the coefficients of second, third and fourth terms in the expansion of `(1+x)^(2 n)` are in A.P, then,

A

`2 n^(2)-9 n+7=0 `

B

`2 n^(2)+5 n+7=0 `

C

`n^(2)-9 n+7=0 `

D

`2 n^(2)-5 n-7=0 `

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The correct Answer is:
A
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