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.**

1.  20/31
2.  20/63
3.  5/31
4.  6/31
5.  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?**

1.  17/91
2.  33/91
3.  51/91
4.  65/91
5.  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.  1/455
2.  2/455
3.  1/91
4.  4/455
5.  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?**

1.  3/22
2.  4/21
3.  2/21
4.  1/14
5.  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?**

1.  23/35
2.  29/35
3.  47/70
4.  43/70
5.  None of these

Solution : 23/35
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