NDA 2013
Exam NDA
Year 2013
Subject Mathematics
Chapter Probability
NDA 2013 · Mathematics · Probability
A bag contains 5 black and 3 white balls. Two balls are drawn at...
A bag contains 5 black and 3 white balls. Two balls are drawn at random one after the other without replacement. What is the probability that both are white?
Options A 1 / 28 1 / 28 1/28 B 1 / 14 1 / 14 1/14 C 3 / 28 3 / 28 3/28 D None of the above
Correct answer C. 3 / 28 3 / 28 3/28
Step-by-step solution
3 C 2 8 C 2 = 3 28 \frac{{ }^3 \mathrm{C}_2}{{ }^8 \mathrm{C}_2}=\frac{3}{28} 8 C 2 3 C 2 = 28 3
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