Probability
Probability - Important Points
| 21. | A box contains 10 red balls and 8 blue balls. Two balls are drawn at random without replacement. What is the probability of getting one red ball and one blue ball? |
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A. 1/4
B. 20/81
C. 4/27
D. 5/18
View Answer Discuss Work SpaceAnswer: option b
Explanation:
| 22. | A bag contains 6 white balls and 4 black balls. Three balls are drawn at random without replacement. What is the probability of getting at least one black ball? |
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A. 1/7
B. 2/7
C. 3/7
D. 4/7
View Answer Discuss Work SpaceAnswer: option c
Explanation:
The probability of getting no black ball can be calculated as follows:
(4/10) * (3/9) * (2/8) = 24/720, which simplifies to 1/30.
The probability of getting exactly one black ball can be calculated as follows:
(4/10) * (6/9) * (3/8) = 72/720, which simplifies to 1/10.
To find the probability of getting at least one black ball, we subtract the probability of getting no black ball and the probability of getting exactly one black ball from 1: 1 - (1/30 + 1/10) = 1 - (1/30 + 3/30) = 1 - 4/30 = 1 - 2/15 = 13/15.
| 23. | A box contains 5 red balls and 3 blue balls. Three balls are drawn at random with replacement. What is the probability of getting all red balls? |
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A. 5/243
B. 1/243
C. 125/243
D. 27/243
View Answer Discuss Work SpaceAnswer: option a
Explanation:
| 24. | A fair coin is flipped four times. What is the probability of getting exactly three tails? |
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A. 1/16
B. 1/8
C. 3/8
D. 1/4
View Answer Discuss Work SpaceAnswer: option c
Explanation:
| 25. | A bag contains 7 red candies, 6 green candies, and 5 blue candies. If one candy is randomly chosen, what is the probability of getting a red or green candy? |
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A. 13/18
B. 1/3
C. 11/18
D. 1/2
View Answer Discuss Work SpaceAnswer: option a
Explanation:
Probability Questions and Answers FAQ
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