a) \(\mathop {\lim }\limits_{n \to + \infty } \frac\); b) \(\mathop {\lim }\limits_{x \to {1^ + }} \frac{{\sqrt {{x^3} - {x^2}} }}{{\sqrt {x - 1} + 1 - x}}.\)

a) \(\mathop {\lim }\limits_{n \to + \infty } \frac\);

b) \(\mathop {\lim }\limits_{x \to {1^ + }} \frac{{\sqrt {{x^3} - {x^2}} }}{{\sqrt {x - 1} + 1 - x}}.\)