MCQ practice · SSC Higher Mathematics Board questions · Chapter 14: Probability
What is the probability of not getting a prime number on throwing a dice?
Think it through first, then pick an option.
- a 1/2
- b 2/3
- c 5/6
- d 1/6
Answer and explanation
Correct answer: a 1/2
The outcomes that are not prime are 1, 4, 6 (1 is not prime). 3 favourable out of 6; P = 3/6 = 1/2.
Why the other options are wrong
- b 2/3: Not 2/3: there are 3 favourable outcomes out of 6, so the probability is 3/6 = 1/2.
- c 5/6: Not 5/6: there are 3 favourable outcomes out of 6, so the probability is 3/6 = 1/2.
- d 1/6: 1/6 is the probability of one particular outcome; here 3 outcomes are favourable, so 1/2.
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