Question 45

For a $$x \in R$$ (the set of all real numbers), $$a \neq -1$$,
$$\lim_{n \rightarrow \infty}\frac{(1^a + 2^a + ... + n^a)}{(n + 1)^{a - 1}[(na + 1) + (na + 2) + ... + (na + n)]}= \frac{1}{60}$$Then a =


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