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Let A = {1, 3, 4, 6, 9} and B = {2, 4, 5, 8, 10}. Let R be a relation defined on A × B such that R = {((a 1 , b 1 ), (a 2 , b 2 )) : a 1  b 2 and b 1  a 2 }. Then the number of elements in the set R is 

1. 160
2. 52
3. 26
4. 180

Correct answer: 160

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