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Coefficient of x^7 in (1 + x)^10 + x(1 +...

Coefficient of `x^7` in `(1 + x)^10 + x(1 + x)^9 + x^2 (1 + x)^8+………..+x^10` is

A

210

B

330

C

420

D

120

Text Solution

Verified by Experts

The correct Answer is:
`B`
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