A and B are two sets. The number of elements in A∪B is 49, the...
MATHEMATICS
WAEC 1997
A and B are two sets. The number of elements in A∪B is 49, the number in A is 22 and number in B is 34. How many elements are in A ∩ E?
- A. 105
- B. 27
- C. 15
- D. 7
Correct Answer: D. 7
Explanation
Let x represent the intersection
34 - x + 22 - x + x = 49
- x = 49 - 56; x = 7
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