# Math

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

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3. 👁 68
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

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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