I disagree with the given answer.
I think that whoever worked that out did not count the two E’s.
The number of ways to arrange the string is .
The group of consonants, , can be arranged in ways.
Copy of question text:
I don't understand how to get the answer.The letters of the words 'MATHS IS THE BEST' are to be arranged in a row. The number of ways this can be done if the consonants are to be together is...
I got as far as:
The answer should be 1 209 600.