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7 October, 12:17

2. In how many ways can five people line up at a bank teller's window?

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  1. 7 October, 13:07
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    The first person can move 5 positions since he is first. The second person can move 4 positions since one is already occupied, and so on ...
  2. 7 October, 15:08
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    5 x 4 x 3 x 2 x 1 = 120

    The first person can move 5 positions since he is first. The second person can move 4 positions since one is already occupied, and so on ...
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