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Counting Techniques

  1. Sep 16, 2013 #1
    A student has five different t-shirts and three pairs of jeans.

    How many days can the student dress without repeating the combination of jeans & t-shirt?
    How many days can the student dress without repeating the combination of jeans & t-shirt and without wearing the same t-shirt on two consecutive days?

    I think the first question is pretty easy and I got it right... 5x3 = 15 days.

    I'm not sure if I'm missing something for the second question, but I'm still getting 15 days. The student could just wear Jeans 1 with Shirts 1-5, then Jeans 2 with Shirts 1-5, and finally Jeans 3 with Shirts 1-5 right?
     
  2. jcsd
  3. Sep 16, 2013 #2

    Dick

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    I don't see anything wrong with that.
     
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