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  4. In n is odd and Cr = nCr then the value of C20-C21+C22-C23+.....+(-1)nC2n is

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Q. In n is odd and $C_r = \,{}^nC_r$ then the value of $C^2_0-C^2_1+C^2_2-C^2_3+.....+(-1)^nC^2_n$ is

Binomial Theorem

Solution:

Correct answer is (a) 0