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