A) 3
B) 4
C) 5
D) 6
Correct Answer: A
Solution :
It is given that, Total number of balls = 12 Number of white balls = x \[\therefore \] Probability of getting a white ball \[=\frac{x}{12}\] Now, 6 white balls are added. \[\therefore \] Total number of balls \[=12+6=18\] Number of white balls \[=x+6\] \[\therefore \] Probability of getting a white ball \[=\frac{x+6}{18}\] According to the question, \[\frac{x+6}{18}=2\times \frac{x}{12}\] \[\Rightarrow \] \[x+6=3x\,\,\Rightarrow \,\,\,x=3\] \[\therefore \] Number of white balls = 3You need to login to perform this action.
You will be redirected in
3 sec