Question

Sets A and B have 3 and 6 elements respectively. what can be the minimum number of elements in AUB

Answer 1

6

Explanation:

n(AUB) = n(A) + n(B) - n(AnB)

n(AUB) can have the minimum number of elements if n(AnB) has the maximum number of elements.

n(AnB) maximum = 3

so n(AUB) = 3+6-3 = 6