For a in RR (the set of all real numbers...

For `a in RR` (the set of all real numbers), `a ne-1,underset(n to oo)lim(1^(a)+2^(a)+…+n^(a))/((n+1)^(a-1)[(na+1)+(na+2)+…+(na+n)])=(1)/(60)` Then a =

A

5

B

7

C

`-(15)/(2)`

D

`-(17)/(2)`

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