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Question
A bag contains 4 white and 6 black balls,- all of the same shape and same size. A ball is drawn from the bag without looking into the bag. Find the probability that the ball drawn is:
(i) a black ball
(ii) a white ball
(iii) not a black ball
Solution
Number of white balls = 4
Number of black balls = 6
Number of total balls or possible event = 6 + 4 = 10 balls
(i) Probability (a black ball)
Number of black balls = 6
Number of total balls = 10
∴ Probability =`6/10=3/5`
(ii) P (a white ball)
Number of white balls = 4
Number of total balls = 10
∴ Probability =`4/10=2/5`
(iii) P (not a black ball)
`="Number of white balls"/"Number of total balls" =4/10 = 2 /5 "`
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