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JAMB Mathematics 1985 Question 35

Question 35

Probability

What is the probability that a number chosen at random from the integers between 1 and 10 inclusive is either a prime or a multiple of 3?

  1. A.7/10
  2. B.3/5
  3. C.4/5
  4. D.1/2
  5. E.3/10
Show the answer and explanation

Answer: B (3/5)

Explanation

Primes: 2, 3, 5, 7. Multiples of 3: 3, 6, 9. Together (counting 3 once) that is 6 numbers out of 10, so the probability is 3/5.