Question

If A = {x: x is natural number divisible by 2 and x< 16} and

B = {x:x is a whole number divisible by 3 and x < 18}, find: n(A – B)

Answer 1

A – B = {2, 4, 6, 8, 10, 12, 14} – {3, 6, 9, 12, 15, 18}

A - B = {2,4, 8, 10, 14}

n(A – B) = 5