Question

Let A = {1, 2, 3, 4,}, B = {3, 4, 5, 6, 7}, and C = {2, 3, 5, 7} Find: B∩C

Answer 1

The notation
`B \cap C` means "B intersect C" telling you to look at the intersecting, or overlapping, region of the Venn Diagram. This is where the common values that are found in BOTH set B and set C.

The values {3, 5, 7} are in both set B and set C.

So that is why
`B \cap C = \{3, 5, 7\}`