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January 28, 2015

January 28, 2015

Posted by **Samantha** on Thursday, November 14, 2013 at 9:58am.

What is the probability of picking a winning number?

Then suppose the Ping Pong ball was not replaced. Now what is the probability?

- Math--PLEASE HELP!!! -
**Reiny**, Thursday, November 14, 2013 at 10:27am10 cases for 1st draw, 10 for the 2nd, 10 for the third, 10 for the 4th

prob = 1/10^4 = 1/10000

if ball is not returned

prob = 1/(10*9*8*7) = 1/5040

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