Question
A box contains 5 red balls and 3 blue balls. Two balls
are drawn at random without replacement. Find the probability that both balls are of the same colour.Solution
Total balls = 5 + 3 = 8 Total ways to choose 2 balls = 8C2 = 28 Favourable cases: Both red: 5C2 = 10 Both blue: 3C2 = 3 Total favourable = 10 + 3 = 13 Probability = 13 / 28.
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