If x = $\frac{\sqrt{5}+\sqrt{3}}{\sqrt{5}-\sqrt{3}}$, y = $\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}$, then (x + y) equals :
1). 8
2). 16
3). $2\sqrt{5}$
4). $2(\sqrt{5}+\sqrt{3})$
2. The value of $\frac{(243)^{\frac{n}{5}}\times 3^{2n+1}}{9^{n}\times 3^{n-1}}$ is
4. The greatest of the following numbers 0.16,$\sqrt{0.16}$,$(0.16)^{2}$, 0.04 is :
6. If x= $1+\sqrt{2}+\sqrt{3}$ then the value of $\left(x+\frac{1}{x-1}\right)$ is
7. If $\sqrt{7}$ = 2.646, then the value of $\frac{1}{\sqrt{28}}$ upto three places of decimal is :-
8. When simplified equal to $(256)^{-\left(4^{-\frac{3}{2}}\right)}$ is