Posted by Cindy on .
How many different ways can the letters in the word COMBINATIONS be arranged if the letter C is first and the letter S is last?
Thank you in advance ^^

Math/ Algebra 2 
Reiny,
Since the first and last are fixed, that leaves you with the letters
OMBINATION , I see two I's and two O's
number of arrangements of these
= 10!/(2!2!) = 907200