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If (1 + x)^n = C0+C1x+C2x^2 + ... + Cnx^...

If `(1 + x)^n = C_0+C_1x+C_2x^2 + ... + C_nx^n`,then for n odd,`C_0^2-C_1^2+C_2^2-C_3^2 + ... +(-1) C_n^2`, is equal to

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