MathDB
Multiplication

Source: 2018 AMC 12A #24

February 8, 2018
AMCAMC 12AMC 12 A2018 AMC 12A

Problem Statement

Alice, Bob, and Carol play a game in which each of them chooses a real number between 0 and 1. The winner of the game is the one whose number is between the numbers chosen by the other two players. Alice announces that she will choose her number uniformly at random from all the numbers between 0 and 1, and Bob announces that he will choose his number uniformly at random from all the numbers between 12\tfrac{1}{2} and 23.\tfrac{2}{3}. Armed with this information, what number should Carol choose to maximize her chance of winning?
<spanclass=latexbold>(A)</span>12<spanclass=latexbold>(B)</span>1324<spanclass=latexbold>(C)</span>712<spanclass=latexbold>(D)</span>58<spanclass=latexbold>(E)</span>23 <span class='latex-bold'>(A) </span>\frac{1}{2}\qquad <span class='latex-bold'>(B) </span>\frac{13}{24} \qquad <span class='latex-bold'>(C) </span>\frac{7}{12} \qquad <span class='latex-bold'>(D) </span>\frac{5}{8} \qquad <span class='latex-bold'>(E) </span>\frac{2}{3}\qquad