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    Re: Hi guys!Need help with combinatorics problem!

    Thanks!:):)
  2. Replies
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    8,174

    Hi guys!Need help with combinatorics problem!

    How many two-element subsets of (1,2,3,4) are there that do not contain the pair of elements 2 and 4?
    a) 1
    b)2
    c)4
    d)5
    e)6

    How did you solve? Explanation please! :)
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