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Full-length FE mock with insightful analytics, weakness diagnosis, and video explanations!
28 Jan 2021, 03:45
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B
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Difficulty:
35%
(medium)
Question Stats:
61% (00:54) correct
39%
(00:56)
wrong
based on 132
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A bag contains two blue socks and two red socks. Two socks are randomly drawn out. What is the probability that that they are matching in color?
A. 1/2
B. 1/3
C. 1/4
D. 1/5
E. 1/6
A. 1/2
B. 1/3
C. 1/4
D. 1/5
E. 1/6
28 Jan 2021, 05:06
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P(2 socks of matching colour) = P(drawing 2 blue socks) + P(drawing 2 red socks)
= P(Blue in first draw)*P(Blue in second draw) + P(Red in first draw)*P(Red in second draw)
= (2/4)*(1/3) + (2/4)*(1/3)
= (1/3)
Ans: B
= P(Blue in first draw)*P(Blue in second draw) + P(Red in first draw)*P(Red in second draw)
= (2/4)*(1/3) + (2/4)*(1/3)
= (1/3)
Ans: B
28 Jan 2021, 06:53
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Bunuel
A bag contains two blue socks and two red socks. Two socks are randomly drawn out. What is the probability that that they are matching in color?
A. 1/2
B. 1/3
C. 1/4
D. 1/5
E. 1/6
A. 1/2
B. 1/3
C. 1/4
D. 1/5
E. 1/6
Total ways of choosing 2 out of 4 socks = 4C2 = 6
Favourable outcomes = both black or both red = 2
Favorable probability \(= \frac{2}{6} = \frac{1}{3}\)
Answer: Option B
