MathematicsHard58×since 2004Q5363Let A={1,3,4,6,9}\mathrm{A}=\{1,3,4,6,9\}A={1,3,4,6,9} and B={2,4,5,8,10}\mathrm{B}=\{2,4,5,8,10\}B={2,4,5,8,10}. Let R\mathrm{R}R be a relation defined on A×B\mathrm{A} \times \mathrm{B}A×B such that R={((a1,b1),(a2,b2)):a1≤b2\mathrm{R}=\left\{\left(\left(a_{1}, b_{1}\right),\left(a_{2}, b_{2}\right)\right): a_{1} \leq b_{2}\right.R={((a1,b1),(a2,b2)):a1≤b2 and b1≤a2}\left.b_{1} \leq a_{2}\right\}b1≤a2}. Then the number of elements in the set R is :A180B26C52D160Check answerSkip