SOLUTION: Find the number of 7 digit phone numbers that can be formed if the first three digits come from the numbers 1 to 3 and the last four digits come from the numbers 1 to 9
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Question 632221: Find the number of 7 digit phone numbers that can be formed if the first three digits come from the numbers 1 to 3 and the last four digits come from the numbers 1 to 9 Answer by graphmatics(170) (Show Source):
You can put this solution on YOUR website! There are three digits available for each of the first three digits. The number of possible first three digits is 3*3*3. For the last four digits the possibilities are 9*9*9*9. 5he solution is 3*3*3*9*9*9*9=177147
