Posted by **Jason** on Saturday, March 5, 2011 at 6:47pm.

In base 5, how many two digit numbers are there?

- Algebra -
**MathMate**, Saturday, March 5, 2011 at 8:12pm
To find the number of 2-digit numbers in base 10, we find:

1. for the first digit, there are 9 choices, as 0 is not admissible.

2. for the second digit, there are all of the 10 choices.

By the multiplication rule, the number of 2-digit base 10 numbers is (10-1)(10)=90.

You can do a similar counting for base 5 numbers.

## Answer This Question

## Related Questions

- ALGEBRA 2... - 1. Simplify 2.3^5 log base 2.3^1 2. How do you solve this matrix ...
- algebra - In base 5, how many two digit numbers are there?
- Algebra 1 - How many two-digit numbers have a tens digit that is greater than ...
- Algebra 1 - How many two-digit numbers have a tens digit that is greater than ...
- Math - Think of a five-digit number composed of odd numbers. The thousands digit...
- algebra - all two-digit numbers whose units digits is half the tens digit?
- algebra - all two-digit numbers whose units digits is half the tens digit?
- algebra - please explaing reversing the digits. Find the product of 2 two digit ...
- college problem solving - a certain two-digit number is 6 less than the sum of ...
- Calculus - Form two four-digit numbers from the digits 2, 3, 4, 5, 6, 7, 8, and ...

More Related Questions