Question

a box has 10 different balls, number of ways of choosing 2 balls from the box are​

Answer 1

Answer:

5005

Step-by-step explanation:

Each combination should have 6 balls out of 10 balls.

Each of the 10 balls may be included in any of the combinations any number of times.

So, it is a case of combination with repetition.

Required number of combinations =(n+r−1)Cr

Here n=10 and r=6

⇒ (10+6−1)

C

6

⇒ 15

C

6

=5005