# Probability

There are 20 balls red,blue or green.If 7 are green and sum of red and blue balls are less than 13.At most how many red balls are there

A. 4

B. 5

C. 6

D. 7

#### Ravi

• Jan 9th, 2013

7

#### JUSTINA MARY

• Jan 11th, 2013

C. 6

#### Ranga swathi

• Mar 7th, 2013

6

#### Ajit

• Mar 10th, 2013

7

#### sumona

• Apr 3rd, 2013

6

#### monica

• Apr 16th, 2013

7

#### Hannah Llana

• May 29th, 2013

6

#### Malay Kotak

• Jun 23rd, 2013

7

#### R D Patel

• Aug 5th, 2013

7

#### Vin

• Nov 12th, 2013

The Question is wrong
if R+B+G=20
and G = 7
so R+B+7=20
R+B=13

So R+B < 13 does not hold good

#### AussieMike

• Sep 10th, 2014

I agree with Vin
Total Balls = T = 20
G = 7
R+B < 13
so that means G+R+B < T, so there must be a fourth color X to make T=R+G+B+X = 20
X+(R+B) = 13
max(R+B) = 12
If we make the assumption that there must be at least one blue ball, at most there can be 11 red balls.
If we make the assumption that there don't have to be any blue balls, at most there can be 12 red balls.

#### sathya narayanan.R

• Oct 28th, 2014

6

#### Don Pryor

• Nov 12th, 2014

6

#### Umer

• Nov 16th, 2014

I dont think Question is complete. As If max number of red balls is 6 then there must be a condition that red and blue balls are equal of less n grater something.

#### sangeeta

• Nov 17th, 2014

6

#### ridwan

• Nov 28th, 2014

7. as the question asked at most how many balls are red and the highest answer is 7 so...

#### Parashuram

• Dec 19th, 2014

6

#### dav

• Dec 19th, 2014

7

#### Kunal

• Apr 26th, 2015

11 coz sum of red and blue balls are less than 13 i.e. 12.....hence, there could be a possibility of having 11 red balls and 1 blue ball  