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Posted by on Saturday, November 27, 2010 at 10:01pm.

In Lisa's first-year college program she must take nine courses including at least two science courses. If there are five science courses, three mathematics courses, four language courses and five business courses from which to choose, how many different academic programs could she follow?

  • math 12 - , Saturday, November 27, 2010 at 11:12pm

    Without any restrictions she could take
    C(17,9) different combinations or 24310

    At least 2 science courses means we have to excluse
    1. no science course
    2. 1 science course

    1. number of ways to take no science = C(5,0)xC(12,9)
    = 220
    2. number of ways to include 1 science course
    = C(5,1)xC(12,8)
    = 2475

    number of ways with at least 2 science courses
    = 24310 - 220 - 2475
    = 21615

    or

    2 science courses: C(5,2)xC(12,7) = 7920
    3 science courses : C(5,3)xC(12,6) = 9240
    4 science courses : C(5,4)xC(12,5) = 3960
    5 science courses: C(5,5)xC(12,4) = 495
    Total = 21615

  • math 12 - , Sunday, November 28, 2010 at 10:37am

    Thank you:) I got that answer too:)

  • math 12 - , Wednesday, March 23, 2016 at 6:32pm

    There are 20 people in a club. In how many ways can the club elect a president, a secretary and a treasurer, on person can hold more than one office?

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