In how many ways can the letters {U, U, U, R, R,R} be arranged?	Choose the correct answer:	A) 20	B) 30	C) 120	D) 720	E) 840
My answer : 20   There is 6! ways to arrange those letters in total, however letter U repeats 3! times and letter R repeats 3! times   =&gt; the way to arrange without repeating = 6!/ [3!x3!] = 20
<result>A</result>
In how many ways can the letters {U, U, U, R, R,R} be arranged?