Question 767024
You missed one thing.

If you count the 2 R's as one letter, then there are actually 6 letters!

Hence they can be arranged in 6! = 720 ways.

Of course, the 2 R's can also be arranged in 2 ways, but since they are identical
letters, it does not count as a different word.

So the answer is 720 possible words and not 120.

Hope you got it :)