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Grade: 11


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

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

10 years ago

Answers : (1)

Aman Bansal
592 Points

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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10 years ago
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