Question

In how many ways can you select two balls out of available five identical green balls? ​

Answer 1

Step-by-step explanation:

Let the balls be a, a, a, a, a, b

1

, b

2

, b

3

, b

4

, b

5

. The number of ways of selecting r identical balls is one. The number of ways of selecting 5-r balls from the 5 different balls is (

5

5−

r

)=(

5

r

) The desired number is

r=0

∑

5

(

5

r

)=2

5

=32