Question

A = {a, b, c, d}, B = {d, f, g, h}. Find the cardinality of (A ∪ B)
1. 8
2. 7
3. 6
4. 4

Answer 1

Correct Answer - Option 2 : 7

Concept:

The cardinality of a set is a measure of a set's size, meaning the number of elements in the set.

 

Calculation:

Here, A = {a, b, c, d}, B = {d, f, g, h}

⇒(A ∪ B) = {a, b, c, d, f, g, h}

Cardinality of (A ∪ B) = number of elements in (A ∪ B)

= 7

Hence, option (2) is correct.