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 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.
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