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Q) A professor has 7 different math books, M1, M2, M3, M4, M5, M6, and M7....

Q) A professor has 7 different math books, M1, M2, M3, M4, M5, M6, and M7. She randomly arranges them on a shelf. What's the probability that:

a) M1, M2, and M3 are next to one another

b) M1 and M2 are next to each other, but they are not first

Math   Statistics-And-Probability   
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