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

Let's begin with a rather straightforward lottery in which players select four digits. The winning number is commonly selected in the following fashion: 10 Ping Pong balls (each with a digit 0 through 9 written on it) are placed in a hopper. One Ping Pong ball is selected. That digit now goes in the first place. That Ping Pong ball is put back in the hopper and the process is repeated three times.

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 10:27am
10 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

## Answer this Question

## Related Questions

- math-probability - A state lottery has a daily drawing to form a four-digit ...
- physics - Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = ...
- physics - Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = ...
- physics - Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = ...
- Math - A bag contains a set of ping pong balls numbered from 1 to 12. If you ...
- Statistics and Probability - The Tri-State Pick 3 lottery game offers a choice ...
- MATH - Need Answer to the Following Please: Using the 9 digits, 1, 2, 3, 4, 5, ...
- math - suppose a lottery game allows you to select a 2-digit number. Each digit ...
- Physics - How much kinetic energy does a 1 kg ball have if it has a velocity of ...
- Math - Need Answer to the Following Please: Using the 9 digits, 1, 2, 3, 4, 5, ...

More Related Questions