Question

a bag contain 12 balls out of which x balls are white . if 1 balk is taken out from the bag find the probability of getting a white ball if six more balls if six more white balls are added to the bag and the probability now for getting a white ball is double the previous one find the value of x
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Answer 1

Answer:

X/18. since total no of obsevations is 12+6=18

Answer 2

no of white balls is 3

Step-by-step explanation:

in first case

n(s)=12

let event be probability of white balls

n(e)=x

probability is x/12

in second case

n(s)=12+6=18

let event be probability of white balls

n(s)=x+6

according to question

x+6/18=2(x/12)

x+6/18=x/6

cross multiplication

6(x+6)=18x

6x+36=18x

12x=36

x=3