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Let A={2,3,4} and B={8,9,12}. Then the n...

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)) in (A xx B, A xx B) : a_1` divides `b_2` and `a_2` divides `b_1`} is

A

36

B

24

C

18

D

12

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