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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
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Join your school's WhatsApp group
Join your school's WhatsApp group
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789