MathDB
Coins and Dice

Source: AMC 10 2008B Problem 16

March 1, 2008
probabilityAMC

Problem Statement

Two fair coins are to be tossed once. For each head that results, one fair die is to be rolled. What is the probability that the sum of the die rolls is odd? (Note that if no die is rolled, their sum is 0 0.) <spanclass=latexbold>(A)</span> 38<spanclass=latexbold>(B)</span> 12<spanclass=latexbold>(C)</span> 4372<spanclass=latexbold>(D)</span> 58<spanclass=latexbold>(E)</span> 23 <span class='latex-bold'>(A)</span>\ \frac{3}{8} \qquad <span class='latex-bold'>(B)</span>\ \frac{1}{2} \qquad <span class='latex-bold'>(C)</span>\ \frac{43}{72} \qquad <span class='latex-bold'>(D)</span>\ \frac{5}{8} \qquad <span class='latex-bold'>(E)</span>\ \frac{2}{3}