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anonymous

  • one year ago

In how many ways can a teacher arrange 4 students in the front row of a class room with a total of 30 students

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  1. dan815
    • one year ago
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    |dw:1436820396478:dw|

  2. dan815
    • one year ago
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    for the first seat there are a total of 30 choices from picking any possible student

  3. dan815
    • one year ago
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    and for each student that is picked in that seat, there is another 29 choices following that picked student for the next seat

  4. dan815
    • one year ago
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    |dw:1436820519859:dw|

  5. dan815
    • one year ago
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    this is best illustrated with tree diagram for smaller examples to understand why this way of multiplication works

  6. dan815
    • one year ago
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    consider, 5 kids and 3 desks

  7. dan815
    • one year ago
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    |dw:1436820600480:dw|

  8. dan815
    • one year ago
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    i did not fill itn all the lines as that will take too long but hopefully you see what is going on there

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spraguer (Moderator)
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