A bag contains 5 black and 4 white balls. A person draws two balls at random. What is the probability that both the balls are of the same colour?
A.1/6
B.5/108
C.4/9✓ Correct
D.5/18
Explanation
Total balls = 9. Total ways to choose 2 = C(9,2) = 36. Both black: C(5,2) = 10. Both white: C(4,2) = 6. Same colour total = 16. Probability = 16/36 = 4/9.
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