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If the coefficient of 2nd, 3rd and 4th terms in the expansion of `(1+x)^(2n)` are in A.P. , show that `2n^2-9n+7=0.`

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
A
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AAKASH INSTITUTE ENGLISH-BINOMIAL THEOREM-Assignment (section-B)
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