There are 20 couples in a party. Every person greets every person except his or her spouse. People of the same sex shake…

There are eight boxes of chocolates, each box containing distinct number of chocolates from 1 to 8. In how many ways fou…

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?

In how many different ways can the letters of the word SMART be arranged?

From a group of 7 men 6 women, 5 persons are to be selected to form a committee so that at least 3 men are there on the …

Find the number of triangles which can be formed by joining the angular points of a polygon of 8 sides as vertices.

The letter of the word LABOUR are permuted in all possible ways and the words thus formed are arranged as in a dictionar…

The number of ways which a mixed double tennis game can be arranged amongst 9 married couples if no husband and wife pla…