Khan/khan-exercises — Issue #7435: Probability 1 - Is 1 a prime?
Author: KhanBugz
Created: 2011-12-01 11:55:08+00:00
State: open
Labels: firefox, other

Reporter: boldewyn@googlemail.com

Hello,

the problem is, that the 1 might be counted as a prime, which leads to the wrong assumption, that 2/3 would be the right answer. A short note, that 1 is *not* a prime number could help here.

Cheers,

[probability_1.html?seed=144&problem=1](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/probability_1.html?seed=144&problem=1&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/probability_1.html?seed=144&problem=1&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%224%2F6%5C%22%22%2C13%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%2C%5B%22hint-activity%22%2C%220%22%2C8%5D%2C%5B%22hint-activity%22%2C%220%22%2C14%5D%5D)

["4/6"]

Mozilla/5.0 (X11; Linux i686; rv:8.0) Gecko/20100101 Firefox/8.0

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