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Class 11 Mathematics Permutations and Combinations PermutationsHard

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How many arrangements of the letters of (MISSISSIPPI) are possible in which all (S)'s are together?

Answer and explanation

Correct answer: (1260)

Treat the four (S)'s as one block, giving (8) units with (I) four times and (P) twice. The number is (\frac{8!}{4!2!}=840).

Related tags

Permutations Repeated Letters Block Method Permutations And Combinations Mathematics Class 11 Mcq

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