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
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B.
27
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C.
15
-
D.
12
-
E.
7
Correct Answer: Option E
Explanation
Let x represent the intersection
34 - x + 22 - x + x = 49
  - x = 49 - 56; x = 7
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