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Find a for which lim(n->oo) (1^a+2^a+3^a...

Find `a` for which `lim_(n->oo) (1^a+2^a+3^a+...+n^a)/((n+1)^(a-1)[(na+1)+(na+2)+...+(na+n)])=1/60`

A

5

B

7

C

`(-15)/(2)`

D

`(-17)/(2)`

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The correct Answer is:
B, D
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