Posted by **Anna** on Saturday, November 21, 2009 at 12:07pm.

The serial number on a $10 bill contains eight non-zero digits. If your $10 bill contains the digit 7 at least once, you win a prize. The probability that your $10 bill will be a prize-winning bill is what?

- Probability -
**economyst**, Monday, November 23, 2009 at 9:35am
I believe I answered this in an earlier post.

There are 9 possible values for the first digit and 9 for the second, and so on. So, there are 9^8 possible serial numbers, where no digits is a zero. Similarly, there are 8^8 possible values where no digit is a zero or a seven. So, the probability there is at least one seven is:

1- (8^8)/(9^8)

## Answer This Question

## Related Questions

- Probability - The serial number on a $10 bill contains eight non-zero digits. If...
- Math - A box contains a one-dollar bill, a five-dollar bill, a ten-dollar bill, ...
- Math - A box contains a one-dollar bill, a five-dollar bill, a ten-dollar bill, ...
- Math (Probability) - Each of two urns contains green balls and red balls. Urn I ...
- Math - Jill and Bill are two members of the Hill family. Jill is 8 years old and...
- Algebra - Tom has a $20 bill, a $10 bill, a $5 bill, and $1 bill. List the total...
- goverment - Which term is applied to a legislator who introduces a bill? ...
- Math - A 3-digit positive integer is selected at random. Find the probability ...
- probability - Assume that there is an urn containing seven $50 bills, six $20 ...
- English - Which of the following sentences is grammatically correct? a.Only Bill...

More Related Questions