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How many ways to choose a president? (8) After you choose the president, how many people are available to be vice-presidents? (7) So the answer is 8 X 7 = 56. |
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Given that N = number of people and C = number being chosen: P = N!/(N-C)! = 8!/6! = (8 X 7 X 6 X 5 X 4 X 3 X 2 X 1)/ (6 X 5 X 4 X 3 X 2 X 1) = 40320/720 = 56 |