Question
A bag contains 3 white balls , 5 blue balls , and 8 red
balls . One ball is picked randomly from the bag and discarded. What is the probability of selecting a red ball from the remaining balls?Solution
Required probability: = Probability of drawing (White in first, Red in second) + Probability of drawing (Blue in first, Red in second) + Probability of drawing (Red in first, Red in second) = (3/16) X (8/15) + (5/16) X (8/15) + (8/16) X (7/15) = (24/240) + (40/240) + (56/240) = (120/240) = (1/2)
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