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Calculate the probability that the product of two numbers selected at random with replacement from...

Further Mathematics
WAEC 2020

Calculate the probability that the product of two numbers selected at random with replacement from the set {-5,-2,4, 8} is positive

  • A. \(\frac{2}{3}\)
  • B. \(\frac{1}{2}\)
  • C. \(\frac{1}{3}\)
  • D. \(\frac{1}{6}\)
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Correct Answer: Option B
Explanation

x -5 -2  4 8

-5 25 10 -20 -40

-2 10 4 -8 -16

4 10 4 -8 -16

4 -20 -8 16 32

8 -40 -16 32 64

Pr(Two numbers is positive) = \(\frac{8}{16}\) 

= \(\frac{1}{2}\) 


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995