A and B are two sets The number of elements in ... - WAEC Mathematics 1997 Question
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
12
correct option: e
Let x represent the intersection
34 - x + 22 - x + x = 49
- x = 49 - 56; x = 7
34 - x + 22 - x + x = 49
- x = 49 - 56; x = 7
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