Permutations an...

The number of distinguishable ways in which the 4 faces of a regular tetrahedron can be painted with 4 different colours is

In how many ways can a mixed doubles tennis game be arranged from a group of 10 players consisting of 6 men and 4 women

If no husband and wife play in the same game, then the number of ways in which a mixed double game can be arranged from among nine married couples is

The number of all numbers that can be formed by using some or all of the digits 1, 3, 5, 7, 9 (without repetitions) is

A cricket team of eleven is to be chosen from among 8 batsmen, 6 bowlers and 2 wicket-keepers. In how many ways can the team be chosen, if there must be at least four batsmen, at least four bowlers and exactly one wicket-keeper?

Find Rank of word ‘wife ‘among the words that can be formed with its letters and arranged as in dictionary is

The maximum number of points at which 4 circles and 4 straight lines can intersect is

On the occasion of Diwali, each student of a class sends greeting cards to every other. If there are 20 students in the class, then the total number of greeting cards exchanged by the students is

The number of all three digit even numbers such that if 5 is one of the digits then next digit is 7 is

Out of 9 consonants and 5 vowels, how many words of 3 consonants and 3 vowels can be formed?