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MATHEMATICS

JAMB 2024 - Question 38

Mathematics 2024 JAMB Past Questions - Question 38: A bag contains 7 red and 4 black identical balls. Two balls were picked at random from the bag and replaced each time. Find the probability the two balls were of same colour.

A bag contains 7 red and 4 black identical balls. Two balls were picked at random from the bag and replaced each time. Find the probability the two balls were of same colour.

A: 54121

B: 65121

C: 2955

D: 2755

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Correct Answer

Explanation

Total Balls 7 + 4 = 11Probability of Picking Two Balls of the Same Colour = RR or BB = 7/11×7/11 + 4/11 × 4/11= 49/121 + 16/121 = 65121