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How many ordered pairs does R = {(x, y): 3x - y = 0} on {1,...,14} have?
A3
B5
C4
D14
Answer & Solution
Correct answer: C. 4
Only x = 1, 2, 3, 4 give y = 3, 6, 9, 12 inside the set, so the pairs are (1,3), (2,6), (3,9), (4,12).
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