MathDB
Rolling Dices

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November 23, 2011
probabilitysymmetry

Problem Statement

A fair 6-sided die is rolled twice. What is the probability that the first number that comes up is greater than or equal to the second number?
<spanclass=′latex−bold′>(A)</span>16<spanclass=′latex−bold′>(B)</span>512<spanclass=′latex−bold′>(C)</span>12<spanclass=′latex−bold′>(D)</span>712<spanclass=′latex−bold′>(E)</span>56 <span class='latex-bold'>(A)</span>\dfrac16\qquad<span class='latex-bold'>(B)</span>\dfrac5{12}\qquad<span class='latex-bold'>(C)</span>\dfrac12\qquad<span class='latex-bold'>(D)</span>\dfrac7{12}\qquad<span class='latex-bold'>(E)</span>\dfrac56
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