# Probility & Statistics TEST TOMMRROW HELP PLS!

• May 21st 2008, 03:01 PM
miemie11
Probility & Statistics TEST TOMMRROW HELP PLS!
Hi can anyone help me understand the concept and tell me the process you have to do to get the answer. I already know the answer but i just dont get how it is.
Question:A paper clip holder has 100 paper clips:30 red, 20 yellow, 25 green, 15 pink, and 10 black.Five clips are randomly drawn without replacement. What it the probability that all five clips are all black or all red?

• May 21st 2008, 06:43 PM
mr fantastic
Quote:

Originally Posted by miemie11
Hi can anyone help me understand the concept and tell me the process you have to do to get the answer. I already know the answer but i just dont get how it is.
Question:A paper clip holder has 100 paper clips:30 red, 20 yellow, 25 green, 15 pink, and 10 black.Five clips are randomly drawn without replacement. What it the probability that all five clips are all black or all red?

Pr(All black) = $\displaystyle \left( \frac{10}{100} \right) \cdot \left( \frac{9}{99} \right) \cdot \left( \frac{8}{98} \right) \cdot \left( \frac{7}{97} \right) \cdot \left( \frac{6}{96} \right) = ......$
Pr(All red) = $\displaystyle \left( \frac{30}{100} \right) \cdot \left( \frac{29}{99} \right) \cdot \left( \frac{28}{98} \right) \cdot \left( \frac{27}{97} \right) \cdot \left( \frac{26}{96} \right) = ......$