Waste of time #1

Discrete Mathematics Level pending

If \(n>2\) and \(C_r\) is the co-efficient of \(x^r\) in \((1+x)^n\) then, \((a-1)^2C_1-(a-2)^2C_2+....+(-1)^{n-1}(a-n)^2C_n=\)

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