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18 October, 16:48

There are 15 students in a social studies class. Two students will be selected to present their term projects today. In how many different orders can two students be selected?

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  1. 18 October, 19:43
    0
    Given:

    15 students

    2 students must be chosen.

    No repetition, no order

    This is a combinations problem. We use this formula: n! / (n-r) ! (r!)

    n = 15; r = 2

    15! / (15-2) ! (r!) ⇒ 15! / 13! * 2! = 105
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