Homework Statement
[SIZE="3"](a) lim_{n\rightarrow\infty} (\sqrt{(n + a)(n + b)} - n) where a, b > 0
[SIZE="3"](b)lim _{n\rightarrow\infty} ([SIZE="3"]n!)1/n2
Homework Equations
The Attempt at a Solution
I tried to use Limit theorems but nothing happened.