. Let A = {x/x is an integer, 0<x<6} and B = {x/x is a positive integer less than 13 and x is
a multiple of 3}. List the number of A and B, and find A ∪ B.
- If P = {x/x2 + 2x -3} and Q = {x/x is an integer, -1 ≤ x ≤ 4}, find P ∩ Q and P ∪ Q.
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