Difference between revisions of "2007 iTest Problems/Problem 4"
(New page: ==Problem== Star flips a quarter four times. Find the probability that the quarter lands heads exactly twice. <math>\mathrm{(A)}\,\frac{1}{8}\quad\mathrm{(B)}\,\frac{3}{16}\quad\mathrm{(C...) |
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Revision as of 21:55, 12 December 2007
Problem
Star flips a quarter four times. Find the probability that the quarter lands heads exactly twice.
Solution
The number of arrangements of the group of letters HHTT is 
, so the probability that two of the flips are heads is 
See Also
| 2007 iTest (Problems, Answer Key) | ||
| Preceded by: Problem 3 |
Followed by: Problem 5 | |
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