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Miyuki

  • 3 years ago

I am studying Discrete Math Structure, currently the topic is on Set Operations. One of the HW questions is: If c(A) = 16, c(B) = 29, and c(A intersect B) = 9, then... c (A Union B) is = ______? What is c? I don't understand the notation c(A) :( I can't find c(A) notation in my textbook :/

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  1. tamtoan
    • 3 years ago
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    try this, draw 2 circles, intersecting each other, the one part belong to both circle (intersection) is 9, the 2 circles with 16 and 29 ...so the outside part of circle 16 is 7 and the other is 20...try to figure out union of A and B ?

  2. tamtoan
    • 3 years ago
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    think of it like this ...set A has 16 elements, set B has 29 elements and 9 of them are in both set.

  3. tamtoan
    • 3 years ago
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    and c is the count of each set

  4. Miyuki
    • 3 years ago
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    Count! Thank you so much :D I figured it out. It is 36.

  5. tamtoan
    • 3 years ago
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    :) very good, enjoy

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