A group has to select a moderator and a secretary from 5 members in the group. How many arrangements of group leaders are possible?, 10, 20, 30, 40, A group has to select two leaders from the 5 members in the group. How many sets of group officers are possible?, 10, 20, 30, 40, How many line segments can be formed from 6 given points with no three of which are collinear., 5, 10, 15, 20, In how many ways can 7 children be seated in a round table?, 120, 720, 5040, 40320, If Pedro must answer any 5 questions on a Math quiz containing 8 questions, in how many ways can he choose the 5 questions?, 56, 126, 2520, 6720

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