Question

A = multiples of 5 between 14 and 26

B = odd numbers between 14 and 26
(a) List the members of (A ∪ B)

Answer 1

(A ∪ B) = {15, 17, 19, 20, 21, 23, 25}

Explanation:

Multiples of 5:

{0, 5, 10, 15, 20, 25, ...}

So between 14 and 26:

A = {15, 20, 25}

Odd numbers between 14 and 26:

B = {15, 17, 19, 21, 23, 25}

(A ∪ B)

All numbers that are part of at least one of these sets. So

(A ∪ B) = {15, 17, 19, 20, 21, 23, 25}