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sixpointer
- Senior | Next Rank: 100 Posts
- Posts: 33
- Joined: Mon Oct 18, 2010 9:04 am
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1.Ticket numbered from 1 to 20 are mixed up and then a ticket is drawn at a random . What is the probablity that the ticket drawn has a number which is multiple of 3 or 5?
1/2,3/20,2/5,1/2
for this do we have to consider 15 also as it is divisible by 3 and 5 both ?
2.In a box there are 8 red , 7 blue,and 6 green balls. One ball is picked up randomly . What is the probablity that the ball is niether red nor green?
2/3,3/4,7/19,8/21,9/21
Iam getting answer as 7/21
3.In a class 30% student offered English 20% offered Hindi and 10% offered both . If a student is selected at random . What is the probablity that he has offered English or Hindi?
2/5,3/4,3/5,3/10
1/2,3/20,2/5,1/2
for this do we have to consider 15 also as it is divisible by 3 and 5 both ?
2.In a box there are 8 red , 7 blue,and 6 green balls. One ball is picked up randomly . What is the probablity that the ball is niether red nor green?
2/3,3/4,7/19,8/21,9/21
Iam getting answer as 7/21
3.In a class 30% student offered English 20% offered Hindi and 10% offered both . If a student is selected at random . What is the probablity that he has offered English or Hindi?
2/5,3/4,3/5,3/10
