MathematicsMedium75×since 2002Q4989Five numbers x1,x2,x3,x4,x5{x_1},{x_2},{x_3},{x_4},{x_5}x1,x2,x3,x4,x5 are randomly selected from the numbers 1, 2, 3, ......., 18 and are arranged in the increasing order (x1<x2<x3<x4<x5)({x_1} < {x_2} < {x_3} < {x_4} < {x_5})(x1<x2<x3<x4<x5). The probability that x2=7{x_2} = 7x2=7 and x4=11{x_4} = 11x4=11 is :A1136{1 \over {136}}1361B172{1 \over {72}}721C168{1 \over {68}}681D134{1 \over {34}}341Check answerSkip