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(i) Set builder form.
R= {(1, 3) , (2, 6) ,(3, 9) , (4, 12) ,(5, 15)}
(ii) Roster form.
R= {(A, B) : B = 3A}
(iii)
domain= {1,2,3,4,5}
range= {3,6,9,12,15}
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