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The coefficient of x20 in the expansion ...

The coefficient of x20 in the expansion of `(1+x^(2))^(40)*(x^(2)+2+1/x^(2))^(-5)` is :

A

`.^(30)C_(10)`

B

`.^(30)C_(15)`

C

`.^(30)C_(25)`

D

`.^(30)C_(20)`

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • The coefficient of x^(3) in the expansion of (1-x+x^(2))^(5) is

    A
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    B
    `-30`
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    D
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    A
    30
    B
    40
    C
    60
    D
    50

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