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Arnab Purkayastha Grade: 12
        


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?

6 years ago

Answers : (5)

SAGAR SINGH - IIT DELHI
879 Points
										

Dear student,


Required probabilty=2/4=1/2
























































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6 years ago
vikas askiitian expert
510 Points
										

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

6 years ago
Mir Noaman Ali IIT-Roorkee
57 Points
										

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 

6 years ago
Mir Noaman Ali IIT-Roorkee
57 Points
										

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 ..............

6 years ago
Sudheesh Singanamalla
114 Points
										

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

6 years ago
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