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Answer :

DSolution :

There are 11 letters viz. 4S's 4I's, 2P's and M in the word MISSISSIPPI. Considering 4S's as one letter, we have 8 letters which can be arranged in `(8!)/(4!2!)` ways. But, 4S's can be put <br> together in `(4!)/(4!)=1` way. <br> `:.` Total number of words `=(8!)/(4!2!)xx(4!)/(4!)=(8!)/(4!2!)=840`.