medium · GMAT Quant
An encrypted key has 4 slots, each of which can be an uppercase letter or a digit. If the first character must be a letter and the key must contain exactly three digits
How many distinct keys can be formed if characters can be repeated?
- 26 × 10^3
- 26 × 36^3
- 4 × 26 × 10^3
- 26 × 10 × 9 × 8
- 10 × 26^3
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