Algebra
posted by Jason .
In base 5, how many two digit numbers are there?

To find the number of 2digit 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 2digit base 10 numbers is (101)(10)=90.
You can do a similar counting for base 5 numbers.
Respond to this Question
Similar Questions

Calculus
Form two fourdigit numbers from the digits 2, 3, 4, 5, 6, 7, 8, and 9, using each digit exactly once, so that the absolute value of the difference of the two numbers is as small as possible. 
algebra
please explaing reversing the digits. Find the product of 2 two digit numbers and reverse the digits and find the product. The products are the same. Does this happen with any pair of twodigit numbers? 
algebra
In base 5, how many two digit numbers are there? 
algebra
all twodigit numbers whose units digits is half the tens digit? 
algebra
all twodigit numbers whose units digits is half the tens digit? 
ALGEBRA 2...
1. Simplify 2.3^5 log base 2.3^1 2. How do you solve this matrix using a graphing calculator AX=B A=9 3 1 B=7 X= x 1 1 1 3 y 16 4 1 21 z 3. How many 4digits numbers have the thousands digit equal to 2 and the units digit equal … 
college problem solving
a certain twodigit number is 6 less than the sum of its tens digit and 7 times its units digit. if the digits are reversed the number is increase by 27. fin the original twodigit numbers 
Algebra 1
How many twodigit numbers have a tens digit that is greater than the units digit? 
Algebra 1
How many twodigit numbers have a tens digit that is greater than the units digit? 
Math
Think of a fivedigit number composed of odd numbers. The thousands digit is two less than the ten thousands digit but two more than the hundreds digit. The tens digit is two more than ones digit which is four less than the hundreds …