If (1+x)^n=C_0+C_1x+C_2x^2+ +C_nx^n, then for n odd, C_1^2+C_3^2+C_5^2+ +C_n^2 is equal to

JEE Main Mathematics question

If , then for odd, is equal to

Answer: (C)

For odd , (the terms and are equal and have opposite signs), so . Their total

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Question ID VK-021253