Let be a relation from the set to itself such that , where are prime numbers\. Then, the number of elements in is:...

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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:: Relation (Mathematics)

Let

R

be a relation from the set

\{ 1,2,3,\ldots,60\}

to itself such that

R = \{(a,b):b = pq

, where

p,q \geq 3

are prime numbers\}. Then, the number of elements in

R

is: