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

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

A

`(n C_(r))^(2) `

B

`n C_(r).n C_(r+1) `

C

` (2 n) C_(r+1) `

D

` (2 n) C_(r) `

Text Solution

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The correct Answer is:
D
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HIMALAYA PUBLICATION-BINOMIAL THEOREM-QUESTION BANK
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