SOLUTION: How many 7-digit telephone numbers can be put on the 318 area code if no number can begin with 0, the 2nd digit must be odd, the 3rd digit must be even, and there are no other rest

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Question 281887: How many 7-digit telephone numbers can be put on the 318 area code if no number can begin with 0, the 2nd digit must be odd, the 3rd digit must be even, and there are no other restrictions?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The 1st digit can be 1-9 or 9 possible numbers
The 2nd digit can be 1,3,5,or 9 or 4 possible numbers
The 3rd digit can be 0,2,4,or 8 or 4 possible numbers
The remaining digits can be 0-9 or 10 possible numbers
There are 9%2A4%2A4%2A10%2A10%2A10%2A10+ = 1,440,000 7-digit phone numbers