prove that [1-2n +2n(n-1)/2!] - [2n(2n-1)(2n-2)/3!]...+[(-1)^n-12n(2n-1)...(n+2)/(n-1)!] = (-1)ⁿ⁺¹(2n)!/1(n!)²

dear student,

applying binomial theorwm in the given question,

1) put n= 1

2) put n=k

3) put n= k+1

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