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Robert has eight guests, two of whom are Jim and John. If the guests will arrive in a random
order, what is the probability that John will not arrive right after Jim?
Solution
Probability that John arrives right after Jim = 7! / 8! = 1/8
Probability that John not arrives right after Jim = 1 - Probability that John arrives right after Jim
= 1 - 1/8
= 7/8

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  • 1. Robert has eight guests, two of whom are Jim and John. If the guests will arrive in a random order, what is the probability that John will not arrive right after Jim? Solution Probability that John arrives right after Jim = 7! / 8! = 1/8 Probability that John not arrives right after Jim = 1 - Probability that John arrives right after Jim = 1 - 1/8 = 7/8