Question:
An integer is chosen at random from 1 to 20. What is the probability that it is a prime number?
An integer is chosen at random from 1 to 20. What is the probability that it is a prime number?
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Remember: 1 is not a prime number.
Updated On: Feb 27, 2026
- 0.4
- 0.5
- 0.2
- 0.3
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The Correct Option is A
Solution and Explanation
Concept:
Probability = $\frac{\text{Number of primes}}{\text{Total numbers}}$
Explanation:
Primes between 1 and 20:
\[
2, 3, 5, 7, 11, 13, 17, 19
\]
Total primes = 8
Total numbers = 20
\[
Probability = \frac{8}{20} = 0.4
\]
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