If C represents coefficient of (1+x)^n, then ∑r=0n∑s=0n (Cr + Cs )=1)(n+1)2^n2)(n+1)(2)^(n+1)3)n(2)^n4)n(2)^(n+1)Show the steps

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C represents the coefficient of (1+x)^n

Does C represent the coefficient of every different term

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