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Black: White: : up:?

If same amount of ice in placed in black and white cloth then ice in black cloth will –

Statements: No river is white. All whites are blacks. Some blacks are huts Conclusions: (I) No river is black (II) At least some whites are huts

A bag contains 15 white balls and some black balls. If the probability of drawing a black ball is thrice that of a white ball, find the number of black balls in the bag.