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If a number is chosen at random from the set {x: 4 \(\leq x \leq...

Mathematics
WAEC 2011

If a number is chosen at random from the set {x: 4 \(\leq x \leq 15\)}. Find the probability that it is a multiple of 3 or a multiple of 4

  • A. \(\frac{1}{12}\)
  • B. \(\frac{5}{12}\)
  • C. \(\frac{7}{12}\)
  • D. \(\frac{11}{12}\)
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Correct Answer: Option C
Explanation

set = 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15

multiple of 3 = 6, 9, 12, 15

multiple of 4 = 4, 8, 12

Prob(multiple of 3 or 4) = Prob(multiple of 3) + pro(multiple of 4)

= \(\frac{4}{12} + \frac{3}{12} = \frac{7}{12}\)


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JAMB CBT Software 2025 - Free Download
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