[SOLVED] Simple Probability

**fobos3** · February 2nd 2009, 04:07 AM

You have a box with 10 white and 5 black balls. What is the probability that after 5 draws you have 2 white and 3 black. I think it's $\frac{C_{10}^{2} \times C_{5}^{3}}{C_{5}^{15}}$ .
Is this correct.

**Plato** · February 2nd 2009, 04:26 AM

Originally Posted by fobos3

You have a box with 10 white and 5 black balls. What is the probability that after 5 draws you have 2 white and 3 black. I think it's $\frac{C_{10}^{2} \times C_{5}^{3}}{C_{5}^{15}}$ .
Is this correct.

The idea is correct but be careful in your notation.
$\color{red}\frac{C_{2}^{10} \times C_{3}^{5}}{C_{5}^{15}}$ .

**Grandad** · February 2nd 2009, 04:29 AM

Hello fobos3

Originally Posted by fobos3

You have a box with 10 white and 5 black balls. What is the probability that after 5 draws you have 2 white and 3 black. I think it's $\frac{C_{10}^{2} \times C_{5}^{3}}{C_{5}^{15}}$ .
Is this correct.

Yes.

Grandad

Thread: [SOLVED] Simple Probability

LinkBack

Thread Tools

Display

[SOLVED] Simple Probability

Probability

Similar Math Help Forum Discussions

[SOLVED] Simple probability problem

[SOLVED] Simple Probability has me stumped

[SOLVED] Simple probability question

[SOLVED] Simple Probability Question (Programming)

[SOLVED] Simple Probability Help

Search Tags