Question

How many permutations of the letters abcdefgh contain the letters abcdefg together in any order

Answer 1

For this problem, I understand how to find something like how many strings contain the string BA and GF. I just look at the set of letters like this:

{BA, GF, C, D, E}

and since I have 5 distinct elements I can calculate the number of permutations with 5!.

However, I am not sure what to do when the two strings overlap such as the number of permutations which contain the string ABC and CDE or CBA BED.

Step-by-step explanation: