medium · GMAT Quant
A technician configures a device with a 4-character serial string. The string uses the 26 letters of the alphabet and 10 digits. If the first character must be a letter and the string must consist only of letters
How many distinct serial strings are possible if repetition is allowed?
- 26^4
- 26 × 36 × 36 × 36
- 36^4
- 26 × 25 × 24 × 23
- 4 × 26
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