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Let A = {2, 3, 4} and B = {8, 9, 12}. Then the number of elements in the relation R = {((a 1 ,b 1 ), (a 2 ,b 2 ))  (A × B, A × B) : a 1 divides b 2 and a 2 divides b 1 } is -

1. 36
2. 24
3. 18
4. 12

Correct answer: 36

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