In how many ways can the letters {U, U, U, R, R} be arranged?
Options:
A) 10  B) 20  C) 120  D) 720  E) 840
There is 5! ways to arrange those letters in total, however letter U repeats 3! times and letter R repeats 2! times   =&gt; the way to arrange without repeating = 5!/ [3!x2!] = 10   answer : 10
<result>A</result>
In how many ways can the letters {U, U, U, R, R} be arranged?