For a R (the set of all real numbers), a ≠ −1, _ n (1^a + 2^a + + n^a) (n + 1)^ a-1 [(na + 1) + (na + 2) + + (na + n) ] = 1 60 Then a =

JEE Advanced 2013 Mathematics question

For (the set of all real numbers), a ≠ −1,

Then a =

Answer: (B)

For a > −1, (Riemann sum of ). The bracket is , and . So the limit is $ = =

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Question ID VK-026228