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1) The number of different ways the starting lineup can be filled is 25P9 = 25!/(16!*9!) = 3,268,760.
2) The number of different ways the offices can be filled is 15P4 = 15!/(11!*4!) = 1365.
3) The number of different ways a three-topping pizza can be formed is 8C3 = 8!/(5!*3!) = 56.