MathDB
Shooting dice

Source: AMC 10 2006A, Problem 13

February 6, 2006
probabilityAMC

Problem Statement

A player pays $5 \$ 5 to play a game. A die is rolled. If the number on the die is odd, the game is lost. If the number on the die is even, the die is rolled again. In this case the player wins if the second number matches the first and loses otherwise. How much should the player win if the game is fair? (In a fair game the probability of winning times the amount won is what the player should pay.) <spanclass=latexbold>(A)</span>$12<spanclass=latexbold>(B)</span>$30<spanclass=latexbold>(C)</span>$50<spanclass=latexbold>(D)</span>$60<spanclass=latexbold>(E)</span>$100 <span class='latex-bold'>(A) </span> \$ 12 \qquad <span class='latex-bold'>(B) </span> \$ 30 \qquad <span class='latex-bold'>(C) </span> \$ 50\qquad <span class='latex-bold'>(D) </span> \$ 60 \qquad <span class='latex-bold'>(E) </span> \$ 100