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Let (1+x)^m = C0 + C1 x + C2 x^2+C3x^3+...

Let `(1+x)^m = C_0 + C_1 x + C_2 x^2+C_3x^3+.....+C_m x^m`, where `C_r=mC_r and A = C_1 C_3 + C_2 C_4+C_3 C_5+.......+ C_(m-2) C_m` then -

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