Posted by **Anonymous** on Thursday, July 26, 2012 at 4:04pm.

Three fair quarters are tossed, and a tail appears on at least one of them. What is the probability that at least one head appears? Express your answer as a common fraction.

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**bobpursley**, Thursday, July 26, 2012 at 5:12pm
For the other two, the probablilty of two tails is 1/2*1/2=1/4

Therefore, pr(at least one head)=1-1/4=3/4

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**Maddie**, Tuesday, August 20, 2013 at 5:22pm
There are a total of eight possible outcomes for three coins: HHH, HHT, HTH, THH, TTH, THT! HTT, TTT. Out of these eight outcomes, seven of these show at least one tail (all except HHH). After counting, we find that six of these seven outcomes have at least one head, so the probability is—6/7.

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**hahaha**, Sunday, November 3, 2013 at 2:36pm
6/7

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