-
xcise_science
- Master | Next Rank: 500 Posts
- Posts: 106
- Joined: Tue Oct 09, 2007 12:25 pm
- Thanked: 1 times
Given: the probability of blue ball is less than 2/5 i.e 0.4
Lets consider the options given.
17 yellow balls.
Total Balls = 12 + 17 = 29
Probability of blue ball is removed - 12/29; approx 0.4, hence No
18 yellow balls.
Total Balls = 12 + 18 = 30
Probability of blue ball is removed - 12/30; 0.4
Since it is given that the Probability is less then 2/5 you can say that 19 is Ans.
To confirm...
19 yellow balls.
Total Balls = 12 + 19 = 31
Probability of blue ball is removed - 12/31; approx 0.38
Ans C.
