Six boxes are numbered 1, 2, 3, 4, 5 and 6. Each box must contain either a white ball or a black ball. At least one box …

There are 6 equally spaced points A, B, C, D, E and F marked on a circle with radius R. How many convex pentagons of dis…

In how many ways a President, VP and Water-boy can be selected from a group of 10 people.

In a cricket match if a batsman score 0, 1, 2, 3, 4 or 6 runs of a ball, then find the number or different sequences in …

In a hockey championship, there are 153 matches played. Every two team played one match with each other. The number of t…

In how many ways can a group of 5 men and 2 women be made out of a total of 7 men and 3 women?

A question paper has two parts, A and B, each containing 10 questions. If a student has to choose 8 from part A and 5 fr…

How many numbers are there between 100 and 1000 such that at least one of their digits is 6?