SOLUTION: To how many patrons could a telephone company furnish numbers having five digits, the first digit not being zero?

Question 1133851: To how many patrons could a telephone company furnish numbers having five digits, the first digit not being zero?
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

There are ways to pick the first digit [-]
Next, there are ways to pick the second digit [ plus the remaining from the first digit]
The 3rd digit is chosen from the remaining numbers.
The 4th digit is chosen from the remaining numbers.
The 5th digit is chosen from the remaining numbers.

So, in summary, there are ways.

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