E = (integers \(\leq\) 20), P = (multiples of 3), Q = (multiples of 4),
MATHEMATICS
WAEC 1994
E = (integers \(\leq\) 20), P = (multiples of 3), Q = (multiples of 4), what are the elements of P'∩Q?
- A. (12)
- B. (4, 8, 16, 20)
- C. (3, 6, 9, 15, 18)
- D. (1,2,5,7,10,11,13,17,19)
Correct Answer: B. (4, 8, 16, 20)
Explanation
E = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}
P = {3, 6, 9, 12, 15, 18}
Q = {4, 8, 12, 16, 20}
P' = {1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20}
P' \(\cap\) Q = {4, 8, 16, 20}
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