If the coefficients of 2nd, 3rd and 4th ...

If the coefficients of 2nd, 3rd and 4th terms in the expansion of `(1+x)^n` are in A.P. then find the value of `ndot`

A

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

B

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

C

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

D

`2n+9n-7=0`

Text Solution

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The correct Answer is:

B

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