Question

Calculate the total number of words that can be formed using the

letters of the word “MISSIPPI” if two ‘S’ and two ‘I’ are adjacent to

each other.

Answer 1

Number of unic elements

M -1

I-1

SS-1

II- 1

P-2

Common number of letters is 8

Total number of words

$\frac{8!}{1!1!1!1!2!}=20160$