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A bag contains white. black and red balls only. A ball is drown at ratidom

A bag contains white. black and red balls only. A ball is drown at ratidom from bag. If the prohability of getting a white ball is and that of a black hall is ,then to find the probabhiity of getting a red ball, It the bag contains 20 black ball the find the total number of balls in the bag

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