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Number of ways of selecting two white balls = 7 C₂
Total number of balls = 7 + 5 + 4 = 16
Number of ways of selecting two balls = 16 C₂
Probability = 7 C₂ ÷ 16 C₂ = (7 × 6) ÷ (16 × 15) = 42 ÷ 240 = 7/20
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