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SephI

Did I do this correctly? "Create a set of numbers and call the set N. Describe a subset of N and explain why it is a subset of N."

  • one year ago
  • one year ago

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  1. SephI
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    N:{1, 2, 3 ,4 ,5 , 6 , 7 ... 20} C:{Numbers divisible by three} ~N{3, 6, 9, 12, 15, 18}

    • one year ago
  2. hartnn
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    yes, the subset is correct, but why the notation ~N ?

    • one year ago
  3. SephI
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    You an use: N' or ~N

    • one year ago
  4. hartnn
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    wouldn't N' or N~ be the complement of N ? use another name for subset, say M

    • one year ago
  5. SephI
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    I don't understand? "wouldn't N' or N~ be the complement of N ?" Isn't it a complement?

    • one year ago
  6. hartnn
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    but your question does not ask for complement, it asks for subset and complement and subsets are 2 different things

    • one year ago
  7. SephI
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    Can you explain the difference, please?

    • one year ago
  8. hartnn
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    yes, A = {1,2,3,4,5} let B be the even numbers in A so B= {2,4} here B is a subset of A since all elements of B are in A now complement of B = B' = B~ = {1,3,5} = elements not in B but are in A = odd elements of A got this much ?

    • one year ago
  9. hartnn
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    so for your example : N:{1, 2, 3 ,4 ,5 , 6 , 7 ... 20} Let C be subset of N defined by C:{Numbers divisible by three} C:{3, 6, 9, 12, 15, 18}

    • one year ago
  10. SephI
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    Okay, so ~B means elements in A that are not in B Subset is elements in B that are in A.

    • one year ago
  11. hartnn
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    so ~B means elements in A that are not in B , correct . subset is a set formed from A(universal set) such that elements of subset are all taken from A only

    • one year ago
  12. hartnn
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    so in your example, in subset c, you are just taking elements of N which are divisible by 3

    • one year ago
  13. SephI
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    Roger that.

    • one year ago
  14. hartnn
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    ask if any more doubts ?

    • one year ago
  15. SephI
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    I'm good. I'll be sure to message you in the future if I have any questions or concerns.

    • one year ago
  16. hartnn
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    good :) or feel free to tag me in your question

    • one year ago
  17. SephI
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    Ok.

    • one year ago
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