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?
- The total number of unique codes is 240.
- Exactly 120 distinct codes can be created.
- There are 400 possible character sequences.
- The set of codes contains 480 unique items.
- A total of 20 different codes are possible.
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