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Probability

by MBA.Aspirant » Tue Jul 05, 2011 10:19 pm
20 students are in a class, half of the students are boys. A 7 member committee is to be formed, out of which 6 are to be girls. what's the probability that the 7th member is also a girl?
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by Anurag@Gurome » Tue Jul 05, 2011 10:36 pm
MBA.Aspirant wrote:20 students are in a class, half of the students are boys. A 7 member committee is to be formed, out of which 6 are to be girls. what's the probability that the 7th member is also a girl?
We have already selected 6 girls for the committee. hence we are left with (20 - 6) = 14 students out of which (10 - 6) = 4 are girls.

Hence, the probability that the 7th member of the committee is also a girl = 4/14 = 2/7
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