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Find the coefficient of x^20 in the expr...

Find the coefficient of `x^20` in the expression of `(1+x^2)^40(x^2+2+1/x^2)^-5`.

A

`^(30)C_10`

B

`^(30)C_25`

C

1

D

none of these

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The correct Answer is:
B
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PATHFINDER-BINOMIAL THEOREM-QUESTION BANK
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