Question discussion

In how many different ways can the letters of the word MISSISSIPPI be arranged so that all four S's are together?

1409Medium DSSSB TGT Computer Science 0 replies 1 views

Correct answer: B

Explanation

Treat SSSS as one block; the 8 units M, I, I, I, I, P, P and [SSSS] can be arranged in 8!/(4! × 2!) = 840 ways.

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