25. A bag contains 15 balls of which x are black and remaining are red. If the number of red balls are increased by 5, the probability of drawing the red balls doubles, then probability of drawing red ball is …….. (a) 1/ 5 (b) 4 /5 (c) 3/ 5 (d) 2 /5
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Correct option is
Correct option isA 1/5
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