WAEC - Further Mathematics (2020 - No. 16)
Calculate the probability that the product of two numbers selected at random with replacement from the set {-5,-2,4, 8} is positive
\(\frac{2}{3}\)
\(\frac{1}{2}\)
\(\frac{1}{3}\)
\(\frac{1}{6}\)
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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