Video Transcript
If π΄ is the set of numbers 12, 14, 16 and π΅ is the set of odd numbers less than or equal to 17, what is π΄ minus π΅?
As π΅ is the set of odd numbers less than or equal to 17, it will contain the numbers 17, 15, 13, 11, and so on. We know that π΄ contains three elements: 12, 14, and 16. These are all even numbers. Weβre asked to work out π΄ minus π΅. And we recall that this means all the elements of π΄ that are not elements of π΅.
As all three elements of π΄ β 12, 14, and 16 β are not elements of π΅, the correct answer is 12, 14, 16. In this case, π΄ minus π΅ is actually equal to π΄. This is because none of the elements in π΅ exist in π΄.
