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four balls are there i pick up two balls out of them two of them are white what is the probability that all of them are white?
Dear student,
Required probabilty=2/4=1/2
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Askiitians Expert
Sagar Singh
B.Tech, IIT Delhi
total balls = 4
white balls = 2
probablity that white ball is taken out = 2/4= 1/2
now only 1 white ball is remaining
total balls = 3
probablity that white ball is taken out = 1/3
total probablity = multiplication of both = 1/6
1/6 is the required ans
probability = favourable /total cases in this case favourable case is choosing 2 white out of 4 white nd total is choosing 2 white out of 2white nd 2 of sum oder colour + choosing 2 white out of 3white and 1 of sum oder colour nd choosing 2 white out of 4 white hence 4c2 / (4c2 + 3c2 + 2c2) calculating it we get 6/11 approve the answer if u have understood the solution
probability = favourable /total cases in this case favourable case is choosing 2 white out of 4 white nd total is choosing 2 white out of 2white nd 2 of sum oder colour + choosing 2 white out of 3white and 1 of sum oder colour nd choosing 2 white out of 4 white hence 4c2 / (4c2 + 3c2 + 2c2) calculating it we get 6/10 = 3/5 approve the answer if u have understood the solution ..............
Number of balls = 4
number of balls picked = 2
colour of 2 balls picked = white
the probability that all of them are white is 1
because
1. all 4 could be white
2. 3 white , 1 of another colour
3. 2 white and 2 of one colour each
the number of white balls could be either 2 or 3 or all 4 of them !
so probabilty that all of them are white is 1/2 or 3/4 or 1
since we get 2 white balls out of 2 balls we pick , the probabilty is 2/2 = 1
Please approve
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