In how many different ways can the letters of the word MISSISSIPPI be arranged if the vowels must always be together? Choose the correct choice from the following answers
A) 48	B) 144	C) 210	D) 420	E) 840
The word MISSISSIPPI has 4 I , 4S , 2P and M .   The only vowel present in the word is I and we have to consider 4 I's as a single group   Number of different ways = 8!/(4!*2!)   =(8*7*6*5)/2= 
<gadget id="calculator">(8*7*6*5)/2</gadget>
<output>840</output>
840   Answer 840
<result>E</result>
In how many different ways can the letters of the word MISSISSIPPI be arranged if the vowels must always be together?