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MCQMediumJEE Main 2025 · 22 January, Shift 1Sets & Operations

Mathematics Question from JEE Main 2025 · 22 January, Shift 1

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

  • A

    3131

  • B

    3636

  • C

    3737

  • D

    2929

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