ATM personal identification number (PIN) codes typically consist of four-digit sequences of numbers. Find the total number of ATM codes possible when the first digit is not 0.
Added by Kathryn G.
Step 1
Since it cannot be 0, there are 9 possible options (1-9). For the second digit, there are 10 options (0-9) since any number can be used. The same goes for the third and fourth digits, so there are also 10 options for each. Show more…
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