Khan/khan-exercises — Issue #6296: Probability 1 - probability one
Author: KhanBugz
Created: 2011-11-14 21:15:46+00:00
State: open
Labels: chrome, win7, wrong-or-unclear

Reporter: preston.bates@gmail.com

"A fair coin is flipped three times. What is the probability of getting heads exactly once? Write your answer as a simplified fraction.

There are 2⋅2⋅2=23=8 possibilities for the sequence of flips."

the question asks what the likelihood of "exactly one" heads of "three flips." 8 potential outcomes, one of eight is exactly that one instance, right?

[probability_1.html?seed=60&problem=2](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/probability_1.html?seed=60&problem=2&debug)

["1/8"]

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.106 Safari/535.2

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