Algebra

there are 10 students in a social studies class. three students will be selected to present their term projects today. In how many different orders canthree students be selected?

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asked by Kim
  1. combinations of 10 three at a time
    =
    10!/ [ 3! (10-3)! ]

    = 10 * 9 * 8 *7* .......1 /[3*2(7*....1) ]

    = 10 * 3 * 4

    = 120

    or look up binary coefficient (10,3)
    = 120

    or look at Pascal's triangle row 10, element 3 (the eleventh row, fourth element really since zero counts) again 120

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    posted by Damon

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