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08 Jan 2021, 10:42
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C
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Difficulty:
25%
(medium)
Question Stats:
73% (00:53) correct
28%
(01:28)
wrong
based on 160
sessions
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Five horses are in a race. Audrey picks two of the horses at random, and bets on them. What is the probability that Audrey picked the winner?
A. 1/10
B. 1/5
C. 2/5
D. 1/2
E. 3/5
A. 1/10
B. 1/5
C. 2/5
D. 1/2
E. 3/5
08 Jan 2021, 10:53
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The answer is C
The number of ways 2 horses can be chosen from 5 horses = 5C2 = 10
The number of ways to chose the winner from the two selected horses are = 2*2C1 = 4
Therefore the probability that Audrey picked the winner = 4/10 = 2/5
The number of ways 2 horses can be chosen from 5 horses = 5C2 = 10
The number of ways to chose the winner from the two selected horses are = 2*2C1 = 4
Therefore the probability that Audrey picked the winner = 4/10 = 2/5
09 Jan 2021, 11:48
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The probability that picking a horse, and it winning the race is 1/5. As we picked two horses, we multiply that by 2. Answer 2/5.
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