12. (a) Find the number of distinguishable permutations of the letters M ISSISS I P P I. (b) In how many of these permut
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12. (a) Find the number of distinguishable permutations of the letters M ISSISS I P P I. (b) In how many of these permut
12. (a) Find the number of distinguishable permutations of the letters M ISSISS I P P I. (b) In how many of these permutations P 's are together? (c) In how many I's are together? (d) In how many P 's are together, and / 's are together? (e) In a random order of the letters M ISSISSIP PI, what is the probability that all S′ 's are together?
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