Solution: In the word MISSISSIPPI, there are 4 I’s, 4S’s and 2P’s. Įxample 12: How many different words can be formed with the letters of the world MISSISSIPPI. The number of permutations of ‘n’ things taken all at a time, when ‘p’ are alike of one kind, ‘q’ are alike of second, ‘r’ alike of third, and so on. Number of permutations of n different things taking all at a time, in which m specified things never come together = n!-m!(n-m+1)! of ways when e & i are together = 5! – 48 = 72
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