Math

Using correct mathematical notation and symbols, express the following in set-builder notation:
Z = {16, 17, 18, 19, 20}

I'm so confused with this....please help :(

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asked by Jen
  1. do it the same way I just showed you in the other post.
    the numbers are between 15 and 20, and they are natural numbers.

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    posted by Reiny
  2. {x | 15 < x < 20, x ∈ N} ??

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    posted by Jen
  3. or would it be this {x | 15 < x < 20, x ∈ z} ???

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    posted by Jen
  4. That would work, except say 15<x<21, that was my error.

    I would use x ∈ N , since the numbers 15 and 20 were not part of the set Z

    or you could say

    {x | 16 ≤ x ≤ 20, x ∈ z}


    btw, I should have had the original above as
    {x | 15 < x < 21, x ∈ N}

    The way I had it, the 20 would have been excluded.

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    posted by Reiny
  5. So your saying this question:
    Express the following in roster form: Set M is the set of natural numbers between fourteen and nineteen, would be
    {x | 15 < x < 21, x ∈ N} ??

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    posted by Jen
  6. Please read my replies above including the correction

    you want the numbers 16,17,18,19,20

    they can be expressed
    either as
    16≤x≤20 , x∈N
    or
    15<x<21, x∈N

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    posted by Reiny

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