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Coefficient of x^n in the expansion of (...

Coefficient of `x^n` in the expansion of `(1+x)^(2n)` is

A

`,^(2n)C_n`

B

`2^n`

C

`(2n!)/(n!)^2`

D

`C_0^2+C_1^2+C_2^2+....+C_n^2`

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The correct Answer is:
A, C, D
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PATHFINDER-BINOMIAL THEOREM-QUESTION BANK
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  4. If (1+x+x^2)^n=a0+a1x+...+a(2n)x^(2n) then

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