If $m$ and $n$ are whole numbers such that $m^{n}=121$,then $(m-1)^{n+1}=?$

What value will come in place of the question mark (?) in the following question? (You are not expected to calculate the exact value)
$10^{3} \times 100^{3} + 999999999 = 10^{?} + 10^{?}$

What is the value of $3^{2}+7^{2}+11^{2}+13^{2}+17^{2}-1^{2}-5^{2}-9^{2}-11^{2}-15^{2} ?$

$\frac{1}{6}$ of $(92 \%)$ of $1 \frac{1}{23}$ of $(650) = 85 + ?$

The value of $1 + 1 + \frac{1}{4 \times 3} + \frac{1}{4 \times 3^{2}} + \frac{1}{4 \times 3^{3}}$ up to four places of decimals is

Which of the following is the $CORRECT$ rationalised form of $\frac{15}{\sqrt{5}+2} ?$