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Find the probability that a number selected at random from 21 to 34 is a...

Mathematics
JAMB 2019

Find the probability that a number selected at random from 21 to 34 is a multiple of 3

  • A. \(\frac{3}{11}\)
  • B. \(\frac{2}{9}\)
  • C. \(\frac{5}{14}\)
  • D. \(\frac{5}{13}\)
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Correct Answer: Option C
Explanation

S = {21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34}

n(S) = 14

multiples of 3 = {21, 24, 27, 30, 33}

n(multiples of 3) = 5

Prob( picking a multiple of 3) = 5/14

There is an explanation video available below.

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Explanation Video

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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts