p and q are positive integers and $${p \over q} + {q \over p} = 3$$, then $${{{p^2}} \over {{q^2}}} + {{{q^2}} \over {{p^2}}}$$ =

The current population of a city is 11,02,500. If it has been increasing at the rate of 5% per annum, what was its population 2 yeas ago?

A superadditive function $f(\cdot)$ satisfies the following property

$$ f\left(x_1+x_2\right) \geq f\left(x_1\right)+f\left(x_2\right) $$

Which of the following functions is a superadditive function for $x>1$ ?

Five different books (P, Q, R, S, T) are to be arranged on a shelf. The books R and S are to be arranged first and second respectively from right side of the shelf. The number of different orders in which P, Q and T may be arranged is ________.