Problem

How many seven-digit telephone numbers are possible if the first two digits cannot be ones or zeros? $64,000,000$ telephone numbers

Solution

Step 1 :The problem is asking for the total number of seven-digit telephone numbers possible if the first two digits cannot be ones or zeros.

Step 2 :The first two digits can be any of the 8 remaining digits (2-9), and the remaining 5 digits can be any of the 10 digits (0-9).

Step 3 :Therefore, the total number of possible telephone numbers is calculated as \(8 * 8 * 10 * 10 * 10 * 10 * 10\).

Step 4 :By calculating the above expression, we get the total number of possible telephone numbers as \(64,000,000\).

Step 5 :Final Answer: The total number of possible seven-digit telephone numbers, if the first two digits cannot be ones or zeros, is \(\boxed{6,400,000}\).

From Solvely APP
Source: https://solvelyapp.com/problems/29470/

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