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Mathematics 10 Online
OpenStudy (anonymous):

3 fair coins are tossed. What's the probability of obtaining at least 2 heads?

OpenStudy (anonymous):

Is it 7/8 too? Because TTT isn't at least?

jimthompson5910 (jim_thompson5910):

Again, list the sample space HHH HHT HTH HTT THH THT TTH TTT and count how many samples have at least two H's in them These are: HHH, HHT, HTH, THH There are 4 out of 8 samples that have at least two heads. So the probability is 4/8 = 1/2

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