Post-UTME Mathematics 2011 Objective — Question 8
Question 8 of 11 from the Post-UTME Screening (Post-UTME) Mathematics 2011 Objective paper, with the correct answer and a full explanation.
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Find the probability that a number selected at random from 20 to 30 is a prime number or a multiple of 3
- A. 6/11Correct
- B. 4/11
- C. 2/11
- D. 8/11
Explanation
From 20-30 (11 numbers), primes are 23,29 (2 numbers); multiples of 3 are 21,24,27,30 (4 numbers); no overlap. Total favourable = 6. Probability = 6/11.
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