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If ak is the coefficient of x^k in the e...

If `a_k` is the coefficient of `x^k` in the expansion of `(1 +x+x^2)^n` for k = 0,1,2,……….,2n then `a_1 +2a_2 + 3a_3 + ………+2n.a_(2n) =`

A

`-a_0`

B

`3^n`

C

`n.3^n`

D

`-n.3^n`

Text Solution

Verified by Experts

The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-BINOMIAL THEOREM-EXERCISE 1B (BINOMIAL COEFFICIENTS)
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