medium · GMAT Quant
A code consists of 3 distinct letters, in order, chosen from A,B,C,D, followed by 2 distinct digits, in order, chosen from 1,2,3,4,5. The code is invalid if the letter C appears anywhere in the letter part AND the digit 5 appears anywhere in the digit part.
How many valid codes are possible?
- 480
- 336
- 144
- 400
- 288
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