Question

3 balls are drawn from a bag containing
4 red and 2 green balls. What is the
probability that exactly two of them are
red?​

Answer 1

Answer:

All possible case in drawing 3 balls from 12  

12

C  

3

​  

=  

3!9!

12!

​  

=220

Fovourable cases to draw exactly 2 red wall  

5

C  

2

​  

×  

7

C  

1

​  

=  

2!3!

5!

​  

×  

1!6!

7!

​  

=70

Hence the required probability =  

220

70

​  

=  

22

7

​