hard · GMAT Quant
A digital security interface generates a 4-digit passcode using only the digits 1, 2, and 3. To maintain security standards, the passcode cannot begin with the digit 1, and no two consecutive digits in the passcode may be identical.
How many distinct valid 4-digit passcodes can be generated?
- 12
- 16
- 24
- 27
- 54
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