medium · GMAT Quant
A 4-character serial number is created using letters and digits. The first character must be a letter. If all characters must be digits except for the first character
How many such serial numbers can be formed if digits can be repeated?
- 26 × 10^3
- 26 × 36^3
- 36 × 10^3
- 26 + 10^3
- 26 × 10 × 9 × 8
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