Question

how many words from, The letters of the word PIERRE can be form beginning with the letters RR.

Answer 1

After arranging the letters RR, you only have 4 choices left, which are the letters P, I E, and E

Answer 2

explanations im getting 12 as my answer but im told i need to check the double counting of letters

Answer 3

So that's 4 * 3 = 12, so yeah you are right.

Answer 4

In case you want to use this for the future on letter arrangements:
\[\frac{(Number~of~letters)!}{(Number~of~repeats~for~a~letter)!(Number~of~repeats~for~another~letter)!}\]

Answer 5

Yuup mhchen is right! 12.

Answer 6

ok thanks for clearing this up for me

Answer 7

i was watching this youtube video that say n!/(n!*n!)
so was thinking it should be 6!/2!*2!

Answer 8

but then was getting 180 words

Answer 9

That video probably had an example with 2 letters repeating twice.

Answer 10

yaaaa