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

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Q.Let A={1,2,3,…,10}A = \{1,2,3,\dots,10\}A={1,2,3,…,10} and B={mn:m,n∈A, m<n,;gcd⁡(m,n)=1}.B = \left\{ \frac{m}{n} : m,n \in A,\; m < n,; \gcd(m,n)=1 \right\}.B={nm​:m,n∈A,m<n,;gcd(m,n)=1}. Then n(B)n(B)n(B) is equal to: