MCQ practice · SSC Higher Mathematics Board questions · Chapter 14: Probability
The tickets are mixed well and one ticket is taken at random. What is the probability that its serial number is a divisor of 40?
Think it through first, then pick an option.
- a 1/5
- b 3/20
- c 1/10
- d 1/20
Answer and explanation
Correct answer: a 1/5
The divisors of 40 are 1, 2, 4, 5, 8, 10, 20, 40, which is 8. 8 favourable out of 40; P = 8/40 = 1/5.
Why the other options are wrong
- b 3/20: Not 3/20: there are 8 favourable outcomes out of 40, so the probability is 8/40 = 1/5.
- c 1/10: Not 1/10: there are 8 favourable outcomes out of 40, so the probability is 8/40 = 1/5.
- d 1/20: Not 1/20: there are 8 favourable outcomes out of 40, so the probability is 8/40 = 1/5.
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