MathDB
2013/8/8/Heads in a row

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November 27, 2013
probabilitycomplementary countingAMC

Problem Statement

A fair coin is tossed 3 times. What is the probability of at least two consecutive heads?
<spanclass=′latex−bold′>(A)</span> 18<spanclass=′latex−bold′>(B)</span> 14<spanclass=′latex−bold′>(C)</span> 38<spanclass=′latex−bold′>(D)</span> 12<spanclass=′latex−bold′>(E)</span> 34<span class='latex-bold'>(A)</span>\ \frac18 \qquad <span class='latex-bold'>(B)</span>\ \frac14 \qquad <span class='latex-bold'>(C)</span>\ \frac38 \qquad <span class='latex-bold'>(D)</span>\ \frac12 \qquad <span class='latex-bold'>(E)</span>\ \frac34
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