The number 142<sup>2</sup> - 1 is divisible by :

$$\,{2^{16}} - 1$$   is divisible by -

The sum of the numerator and denominator of a positive fraction is 11. If 2 is added to both numerator and denominator, …

In a 4-digit number, the sum of the first two digits is equal to that of last two digits. The sum of the first and last …

Find the value of $$\frac{1}{5} + $$   $$999\frac{{494}}{{495}} \times 99$$   = ?

$$999\frac{{98}}{{99}} \times 99$$   is equal to :

The sum of the digits of two-digit number is 10, while when the digits are reversed, the number decrease by 54. Find the…

$$\frac{2}{3}$$ of three-fourth of a number is :