Permutations and Factorials

How many different 'words' can you make using all the letters of the world MISSISSIPPI if
(A) there are no restrictions
(B) the word must end in an I
(C) the word cannot end in an I

Solution:

(A) 11! / 3!2!3!3! = 34650

(B) I have no idea where to begin

(C) Ditto

(10!) / [ (3! *4! * 2! )]...........i think....this is for B

u might have A incorrect.........i think it should be 11! / ( 4! * 4! * 2!) .......as 4 i , 4 s ans 2 p..........

for ans to C ............it must be (Ans A - Ans B)