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If (1+x+x^(2))^(n) = sum(r=0)^(2 n) a(r)...

If `(1+x+x^(2))^(n) `= `sum_(r=0)^(2 n) a_(r). x^(r)` then
`a_(1)-2 a_(2)+3 a_(3)-..-2 n. a_(2n) `=

A

0

B

n

C

`-n `

D

`2 n `

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The correct Answer is:
C
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HIMALAYA PUBLICATION-BINOMIAL THEOREM-QUESTION BANK
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  6. The coefficient of x^(4) in ((x)/(2)-(3)/(x^(2)))^(10) is

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  15. In the binomial expansion of (1+x)^(15), the coefficients of x^(r ) an...

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