# 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

Q1. **Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 5?**

1.  1/2
2.  2/5
3.  8/15
4.  9/20

Solution : 9/20
Q2. **A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?**

1.  10/21
2.  11/21
3.  2/7
4.  5/7

Solution : 10/21

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Q3. **In a box, there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green?**

1.  1/3
2.  3/4
3.  7/19
4.  8/21
5.  9/21

Solution : 1/3
Q4. **What is the probability of getting a sum 9 from two throws of a dice?**

1.  1/6
2.  1/8
3.  1/9
4.  1/12

Solution : 1/9

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Q5. **Three unbiased coins are tossed. What is the probability of getting at most two heads?**

1.  3/4
2.  1/4
3.  3/8
4.  7/8

Solution : 7/8
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