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 = { 3n2  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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