What is the result after rationalising the denominator of the expression

$ \frac{1}{\sqrt{5}+\sqrt{6}-\sqrt{11}}$ once?

When the digits within the number are multiplied with each other, the product of which of the following numbers is the lowest?

$435,224,823,902$

Consider the following statements:

(i) For every positive real number $x,x-10$ is positive.

(ii) Let $n$ be a natural number. If $n^2$ is even, then $n$ is even. $f$

(iii) If a natural number is odd, then its square is also odd.

Then

Rationalise the denominator and simplify :

$\frac{\sqrt{5}+\sqrt{3}}{\sqrt{5}-\sqrt{3}}$

If the rationalised form of $\frac{1}{\sqrt{7}-\sqrt{6}}$ is in the form $\sqrt{a}+\sqrt{b}$ then, write the value of $\left(a+b\right)$ as final answer.