1.

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

Answer»

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


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