If A and B are two sets such that A has 40 elements, ? ∪ ? has 60 elements, and ? ∩ ? has 10 elements, how many elements does B have?
- A. 40
- B. 30
- C. 25
- D. 45
- 30
Please select one of the options to reveal the correct answer.
Please select one of the options to reveal the correct answer.