Let $A={1,2,3,\ldots \ldots .,10}$ and $B={\frac{m}{n}:m,n\in A,m Then \(n(B)$ is equal to

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Let \(A={1,2,3,\ldots \ldots .,10}\) and \(B={\frac{m}{n}:m,n\in A,m Then \(n(B)\) is equal to