[SOLVED] 10 marbles in a set- 7 red, 3 green. P(1 green) in sample of 5 ?

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December 8th 2008, 04:04 PM
dan569

[SOLVED] 10 marbles in a set- 7 red, 3 green. P(1 green) in sample of 5 ?

A bag contains 10 marbles - 7 red, and 3 green. What is the probability that there will be exactly 1 green marble in a sample of 3?

Is it:
$\frac{3}{10} * \frac{7}{9} * \frac{6}{8} * 3C1$ ?
December 8th 2008, 05:01 PM
Plato

Is that equal to $\frac{{3 \choose 1}{7 \choose 2}}{{10 \choose 3}}$ ?
December 9th 2008, 01:55 AM
dan569

Quote:

Originally Posted by Plato

Is that equal to $\frac{{3 \choose 1}{7 \choose 2}}{{10 \choose 3}}$ ?

Yeah, apparently it is. Thank you.

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