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On A = {1, 2, 3, 4, 5, 6}, R = {(x, y) : y = x + 1}. How many pairs does R have?
A4
B5
C6
D7
Answer & Solution
Correct answer: B. 5
The pairs are (1,2), (2,3), (3,4), (4,5), (5,6); x = 6 gives y = 7 which is outside A.
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