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In how many ways can 9 friends sit at a dinner table if two of them, Anna and Bob, insist on having exactly two people seated between them? (As usual, two seatings are considered the same if one is a rotation of the other.)

 Oct 29, 2017

Anchor Bob and Anna in any of two chairs......and they can be arranged in 2 ways.... [ Bob on Anna's left or right....]


And the other people can be arranged in 7!  = 5040 ways


So....the total arrangements are  2 * 7!  =   10080  ways



cool cool cool

 Oct 29, 2017

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