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[(n+2)^(n)C(0)2^(n+1)-(n+1)^(n)C(1)2^(n)...

[(n+2)^(n)C_(0)2^(n+1)-(n+1)^(n)C_(1)2^(n)+n^(n)C_(2)2^(n-1)-cdots" is equal to "],[" a."4],[" c."4(n+1)quad " b."4n],[" d."2(n+2)]

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