 # four balls are therei pick up two balls out of themtwo of them are whitewhat is the probability that all of them are white?

12 years ago

Dear student,

Required probabilty=2/4=1/2

All the best.

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Sagar Singh

B.Tech, IIT Delhi

12 years ago

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

12 years ago

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

12 years ago

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

12 years ago

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