# 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

Q16. **The probability that a number selected at random from the first 50 natural numbers is a composite number is -.**

1.  21/25
2.  17/25
3.  4/25
4.  8/25
5.  9/25

Solution : 17/25
Q17. **A coin is tossed five times. What is the probability that there is at the least one tail?**

1.  31/32
2.  1/16
3.  1/2
4.  1/32
5.  N0ne of these

Solution : 31/32
Q18. **If a number is chosen at random from the set {1, 2, 3, ...., 100}, then the probability that the chosen number is a perfect cube is -.**

1.  1/25
2.  1/2
3.  4/13
4.  1/10
5.  9/13

Solution : 1/25
Q19. **Out of first 20 natural numbers, one number is selected at random. The probability that it is either an even number or a prime number is -.**

1.  1/2
2.  16/19
3.  4/5
4.  17/20
5.  3/5

Solution : 17/20

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Q20. **If two dice are thrown together, the probability of getting an even number on one die and an odd number on the other is -.**

1.  1/4
2.  1/2
3.  3/4
4.  3/5
5.  None of these

Solution : 1/2
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