Find Au B if A = { 4,7,10,13,17} and B={3,5,7,9}.

Combine the two sets to form one giant set. If needed, toss out any duplicate values.

So,

A U B = {4,7,10,13,17, 3,5,7,9}

Toss out the duplicate item "7" and sort the values to get

A U B = {3,4,5,7,9,10,13,17}