Question: A, B. C, D, E and F are six students. In how many ways can they be seated in a row if. a) there are

A, B. C, D, E and F are six students. In how many ways can they be seated in a row if. a) there are no restrictions on the seating; b) A and B must sit beside each other; c) A and B must not sit beside each other; d) D, E and F must sit beside each other; e) A and F must sit at the end of each row

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