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For a in R (the set of all real number...

For `a in R` (the set of all real numbers), `a!=-1),` `(lim)_(n->oo)((1^a+2^a++n^a)/((n+1)^(a-1)[(n a+1)+(n a+2)+......(n a+n)])=1/(60.)` Then `a=` (a)`5` (b) 7 (c) `(-15)/2` (d) `(-17)/2`

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