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05 Dec 2014, 13:28
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
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Question Stats:
85% (00:54) correct
15%
(01:18)
wrong
based on 124
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If 6 of the 10 members of a certain class are boys, what is the probability that two members , selected at random without replacement are both boys.
A. 1/10
B. 1/6
C. 1/5
D. 1/3
E. 1/2
A. 1/10
B. 1/6
C. 1/5
D. 1/3
E. 1/2
06 Dec 2014, 05:43
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sunita123
We are told that we have a case without replacement.
\(P=\frac{C^2_6}{C^2_{10}}=\frac{1}{3}\) or \(P=\frac{6}{10}*\frac{5}{9}=\frac{1}{3}\)
06 Dec 2014, 23:07
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Bunuel
Typo. \(P=\frac{C^6_2}{C^{10}_{2}}\)
