Set of Fractions Count (Jee Mains)

Sets & Relations

Medium

Set of Fractions Count

Let A = {1,2,3,.......,10} and
$B = \left\{ {\frac{m}{n}:{\text {m, n}}{\mkern 1mu} \in {\text {A}},{\text {m }} < {\text { n}}\,{\text {and}}\,\,{\text {gcd}}({\text {m}},{\text {n}}){\text { = 1}}} \right\}$
Then n(B) is equal to :

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