Probability
Probability: Probability Formulas, Probability Meaning, Conditional Probability Definition, Probability Problems, Probability Questions with Solved Exercises
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Online Aptitude Questions with Answers on Probability
Q31. **A box contains nine bulbs out of which 4 are defective. If four bulbs are chosen at random, find the probability that exactly three bulbs are good.**
- 20/31
- 20/63
- 5/31
- 6/31
- 26/31
Solution : 20/63
Q32. **A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If four marbles are picked at random, what is the probability that none is blue?**
- 17/91
- 33/91
- 51/91
- 65/91
- None of these
Solution : 33/91
Q33. **A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If three marbles are picked at random, what is the probability that they are all blue?**
- 1/455
- 2/455
- 1/91
- 4/455
- None of these
Solution : 1/455
Q34. **A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If two marbles are picked at random, what is the probability that they are either blue or yellow?**
- 3/22
- 4/21
- 2/21
- 1/14
- None of these
Solution : 2/21
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Q35. **A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. If two marbles are drawn at random, what is the probability that at least one is green?**
- 23/35
- 29/35
- 47/70
- 43/70
- None of these
Solution : 23/35
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