hard · GRE Quant
A code consists of 4 characters: 2 letters followed by 2 digits.
If the letters must be chosen from A, B, C, D without repetition and the digits must be chosen from 1, 2, 3, 4, 5 without repetition, how many unique codes are possible?
- 240
- 120
- 400
- 480
- 20
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