Probability Question 411
Question: A bag contains 5 black balls, 4 white balls and 3 red balls. If a ball is selected randomwise, the probability that it is a black or red ball is
[EAMCET 2002]
Options:
A) $ \frac{1}{3} $
B) $ \frac{1}{4} $
C) $ \frac{5}{12} $
D) $ \frac{2}{3} $
Correct Answer: D
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Answer:
Solution:
P(Black or Red) $ =\frac{^{5}C_1+{{\,}^{3}}C_1}{^{12}C_1}=\frac{2}{3} $ .
BETA
