In how many ways can the letters {U, U, U, R} be arranged? Choose the correct choice from the following answers:
A) 4
B) 20
C) 120
D) 720
E) 840
My answer : 4   There is 4! ways to arrange those letters in total, however letter U repeats 3! times and letter R repeats 1! times   =&gt; the way to arrange without repeating = 4!/ [3!x1!] = 4
<result>A</result>
In how many ways can the letters {U, U, U, R} be arranged?