Monday
May 20, 2013

# Homework Help: Algebra 1:Problem Solving

Posted by Thea on Sunday, October 4, 2009 at 7:07pm.

How many different seven-digit telephone numbers are available if the only restriction is that the first digit can't be 0? Is there a formula for this to make it simpler? Then I'll solve this problem myself.

• Algebra 1:Problem Solving - Reiny, Sunday, October 4, 2009 at 7:12pm

there are 9 ways to fill the first place

there are 10 ways to fill the second place, so far we have 9x10

there are 10 ways to fill the third place, so far we 9x10x10

etc.

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