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A bag contains 5 white, 4 red and 3 black balls. A ball is drawn, what is the probability that it is not black?

+1 vote
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A bag contains 5 white, 4 red and 3 black balls. A ball is drawn at random from the bag, what is the probability that it is not black?

posted Apr 8, 2016 by anonymous

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4 Answers

+1 vote

total no. of balls=5+4+3=12
no. of black balls=3
probability of choosing a black ball=3C1/12
=3/12
=1/4
total probability=1
probability of not choosing a black ball=1-(1/4)
=3/4

answer Apr 9, 2016 by anonymous
0 votes

Of the 12 balls 9 are not black. So the probability is 9/12 = 75%

answer Apr 8, 2016 by Jcm
0 votes

Let us calculate the probability of extracting a black ball
P = number of black balls / total number of balls = 3 / 12 = 0,25
Then, the probability of extracting a ball which is not black is just the contrary , P1 = 1 - P = 1 - 0,25 = 0,75

answer Apr 12, 2016 by anonymous
0 votes

75% EZ as pie

answer Jun 28, 2016 by anonymous



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