Question

In a bag there are ten balls in which three are
red. The probability that there will be atteast one
red ball, in a draw of two balls is​

Answer 1

Answer:

Step-by-step explanation:

No.of ways of choosing 1 red & 1 other ball =  

3

C  

1

​  

.  

7

C  

1

​  

=3×7=21

No of ways of choosing 2 red  balls =  

3

C  

2

​  

=3

Probability of choosing at least 1 red ball  

10

C  

2

​  

 

3

C  

1

​  

−  

7

C  

1

​  

+  

3

C  

2

​  

 

​  

 

10

C  

2

​  

→ choosing any 2 balls =  

45

24

​  

=  

15

8

​