In this video tutorial I show you how to calculate how many arrangements or permutations when letters or items are to stay together.

The following examples are given with worked solutions.

1) In how many ways can the letters in the word HELLO be arranged where the L’s are together?

2) In how many ways can 3 women and 4 men sit in a line if the women always sit together?

3) How many ways can the letters in the word PARALLEL be arranged if the P and R are together?