Probability · Question 25 · Medium
A number is chosen at random from 1 to 100. What is the probability that it is a perfect square or a perfect cube?
- 1/10
- 7/50
- 13/100
- 3/25
Answer and explanation
Answer: D. 3/25
Explanation: Squares: 10 (1 to 100); cubes: 4 (1, 8, 27, 64); both: 1 and 64. So 10 + 4 − 2 = 12 numbers. Probability = 12/100 = 3/25.
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