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Probability - Quantitative Aptitude (MCQ) questions for Q. 71
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Probability
Q. A box has 10 black and 10 white balls. What is the probability of getting two balls of the same color?
- Published on 12 Jun 15
a.
10/19
b.
9/38
c.
9/19
d.
5/38
ANSWER: 9/19
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Discussion
Vaibhav
-Posted on 18 Aug 20
given problem means:you choose either two black or two white.
two black means:one is black and second is also black.
two white means:as black ball
prob. of two black = 10/20*9/19
prob. of two white = 10/20*9/19
total = 2(10/20*9/19) = 20/20*9/19
so probability = 9/19
Shubham
-Posted on 27 Jan 17
(10C2+10C2)/20C2=9/19.....+ sign is used because either of the 2 colors can appear
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