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Set theory issue

  1. Jul 18, 2011 #1
    in a coaching centre of 70 but 4 students went on a university visit.31 went to unilag,35 went to lasu and 36 went to u.i. 10 went to all the three universities, 12 went to unilag only, 13 also went to lasu only, 15 went to u.i only. how many students visited

    1 . . unilag and lasu

    2 . .at least 2 universities

    3 . . exactly 2 universities

    4 . .u.i or unilag but not lasu
  2. jcsd
  3. Jul 18, 2011 #2
    draw the typical sketch of 3 circles where all 3 intersect in the middle and around you have 2-circle intersection areas....start populating the areas according to the description of the problem
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