The difference of the squares of two consecutive even integers is divisible by which of the following integers ?

Six bells start ringing together and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. how many times w…

The sum of two numbers is 684 and their HCF is 57. Find all possible pairs of such numbers.

The least number of five digits which is divisible by 123 ?

It is being given that (2<sup>32</sup> + 1) is completely divisible by a whole number. Which of the followin…

The smallest number of four digits which on division by 4, 6, 10 and 15 leaves a remainder 2 in each case is:

Find the sum of all positive multiples of 5 less than 100.

The smallest five digit number which is divisible by 12, 18 and 21 is :