MathDB

8

Part of 2013 AMC 8

Problems(1)

2013/8/8/Heads in a row

Source:

11/27/2013
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
probabilitycomplementary countingAMC