In how many ways can 5 boys and 4 girls be arranged on a bench if
(a) Boys and girls are in a separate group
(b) Mary and Phillip wish to stay together
(C) There is no restriction
(d) John and Daniel wish to stay together

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  1. a) the boys could be on the left as a group or on the right as a group
    number of ways = 2(5!)(4!) = ...

    b) they can only be together when they stand next to each other near the
    number of ways = 2(4!)(1)(1)(3!) = ...

    c) no restriction.... number of ways = 9!

    d) you do it, let me know how you did it.

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  2. I would assume that case b) doesn't depend on case a), in which case Mary and Phillip can be considered as one person (with 2 ways to position them relative to each other), so:
    2(8!) ways.

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  3. 8c8×2

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