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Let A=1{1, 3, 4, 6, 9} and B=4{2, 4, 5, ...

Let `A=1{1, 3, 4, 6, 9} and B=4{2, 4, 5, 8, 10}`. Let R be a relation defined on `A xxB` such that `R={((a_1,a_2),(a_2,b_2)):a_1 le b_2 and b_1 le a_2}.` Then the number of elements in the set R is

A

26

B

160

C

52

D

180

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