2005
Mathematics
JAMB
A box contains 5 blue balls, 3 red balls and 2 white balls. Two balls are selected from the box with replacement. Find the probability of obtaining two blue or two red balls
A.
17/50
B.
3/25
C.
1/50
D.
3/250
Correct Answer: 17/50
Explanation
Blue balls = 5 Red balls = 3 White balls = 2 Total = 10 P(Two blue) = 5/10 * 5/10 = 25/100 P(Two Red) = 3/10 * 3/10 = 9/100 ∴P(Two blue or two red balls) = 25/100 + 9/100 = 34/100 = 17/50
Blue balls = 5 Red balls = 3 White balls = 2 Total = 10 P(Two blue) = 5/10 * 5/10 = 25/100 P(Two Red) = 3/10 * 3/10 = 9/100 ∴P(Two blue or two red balls) = 25/100 + 9/100 = 34/100 = 17/50THIS WEEK's
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