Let A=(1,2,3) and B=(4,5,6,7,8). Define the relation R between the sets A and B as aRb if b2a. Which expression gives a subset

Question

Let A=(1,2,3) and B=(4,5,6,7,8).
Define the relation R between the sets A and B as aRb if b>2a.
Which expression gives a subset of R
p\
O (a, 6) for all a EA
O (a, 5) for all a EA
(1, b) for all be B
O (2, b) for all be B

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