Multiple choice

There are 9 balls in a bag. 2 balls are selected at random. How many different ways of selecting 2 balls are there?

  1. 32

  2. 36

  3. 40

  4. 42

  5. 45
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The number of ways to select 2 balls from 9 is 9C2 = (9 * 8) / 2 = 36.

AI explanation

To find the different ways of selecting 2 balls from 9, we use the combinations formula nCr = n! / (r! * (n-r)!). Substituting the values gives 9C2 = 9! / (2! * 7!) = (9 * 8) / 2 = 36. The number of ways is 36.

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