Posted by **Justin** on Saturday, September 8, 2012 at 2:52pm.

How can I put A={1,4,7,10,13,16,19,22,25,28} in set builder notation. I just learned this and can't figure it out.

- math -
**Reiny**, Saturday, September 8, 2012 at 3:06pm
notice all the numbers are 3 apart

so the formula to generate the numbers would be

3n - 2, where n ∈ N_{0}

so

A = { 3n-2 | n ∈ N_{0} , n ≤ 10 }

- oops -math -
**Reiny**, Saturday, September 8, 2012 at 3:08pm
I just noticed that I wanted the n's to start at 1, not at 0

so change it to

{......| n ∈ N ......}

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