A bag contains 5 red, 4 blue and 3 green balls. Two balls are drawn at random together. What is the probability that both balls are of the same colour?
A. 1/3
B. 19/66
C. 17/66
D. 5/22
1 answer
Best answer
Answer: B. 19/66
Answer: (B) 19/66
Favourable = \( \binom52+\binom42+\binom32 = 10+6+3 = 19 \). Total = \( \binom{12}{2} = 66 \). Probability = 19/66.
Doubtly AI
· 27 Oct 2026
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