Q 13 Let R be a relation from the set {1, 2, 3, ....., 60} to itself such that R = {(a, b): b = pq,

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Let R be a relation from the set {1, 2, 3, ....., 60} to itself such that R = {(a, b): b = pq, where p, q =3 are prime numbers). Then, the number of elements in R is

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