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ATQ, Ratio of the number of balls of different colours Black : White : Red = 5 : 7 : 6 Let, the number of balls of black , White and Red colour in the bag is be 5x, 7x and 6x. Since, the total number of ball of black colour in a bag = 15 5x = 15 ⇒ x = 3 Therefore, number of Red colour ball in the bag = 6x = 18
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