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ATQ,
Number of black balls in the box = 72 × (1/6) = 12 Remaining balls = 72 – 12 = 60 Let, number of purple balls and white balls be 4x and x, respectively, Therefore, 4x + x = 60 5x = 60 x = 60/5 = 12 So, number of purple balls = 4 × 12 = 48 Therefore, required probability = 48/72 = 2/3
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