Let \(A=\{1,3,4,6,9\}\) and \(B=\{2,4,5,8,10\}\). Let \(R\) be a relation defined on \(A \times B\) such that \(R=\left\…

Let \(A=\{1,3,4,6,9\}\) and \(B=\{2,4,5,8,10\}\). Let \(R\) be a relation defined on \(A \times B\) such that \(R=\left\{\left(\left(a_1, b_1\right)\right.\right.\), \(\left.\left(a_2, b_2\right)\right): a_1 \leq b_2\) and \(\left.b_1 \leq a_2\right\}\). Then the number of elements in the set \(R\) is

[JEE Main 2023, 11 Apr (Shift 2)]