How many different 7-letter permutations can be formed from 5 identical H's and two identical T's?

Algebra
Tutor: None Selected Time limit: 1 Day

I don't understand how to put this in an expression

May 5th, 2015

The answer is 7 !/ (5! 2!) = 21

Please let me know if you have any questions and best me if you are satisfactory.

May 5th, 2015

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