- #1

tomwilliam

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Thread moved from the technical math forums to the schoolwork forums

**TL;DR Summary:**Chance of picking 2 named people when randomly choosing 3 from a group of 30.

For my daughter's homework question:

There is a group of 12 girls and 18 boys. Two of them are twins (girl and boy). If I select three at random, what is the chance that the twins will be chosen?

I thought that it would be

P = 1/30 x 1/29 x 28/28

Because the first two choices have to be those specific named individuals, but then the third choice can be anyone. Now I'm not sure, because the order shouldn't matter.

Is this solution correct?

Thanks!