## Realated Questions

In how many ways can 21 books on English and 19 books on hindi be placed in a row on a shelf so that two books on hindi may not be together

Out of 7 consonants and 4 vowels, how words of 3 consonants and 2 vowels can be formed

In a group of 6 boys and 4 girls .four children are to be selected. In how many different ways can they be selected such that at least one boy should be there