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Thread: SAT math counting problems

  1. #1

    SAT math counting problems

    SAT math counting problems

    I need help with the following question:

    "In how many different ways can 4 students be seated in two seats?"

    Thanks!!

  2. #2

    SAT maths counting problem permutations

    SAT maths counting problem permutations

    "In how many different ways can 4 students be seated in two seats?"
    The number of ways you can change the order of a set of objects is called the number of PERMUTATIONS of that set of objects.

    The total number of ways of arranging n objects, taking r at a time is gibe by the following formula:

    , where

    So, in your case, you have 4 students taking 2 at a time

    ways.

    The above calculations could be done easily in your GDC casio fx-9860GII SD for example as follows:

    OPTN>PROB>nPr and set n=4 and r=2


    Another way to solve this problem is that the first seat can be filled with 4 ways and the second with the remaining 3ways(students). So, the total ways are 4x3=12


    Hope these help!!

  3. #3
    Thanks Oliver!!

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