medium · GMAT Quant
An automated system produces 4-digit identification codes using the digits 1, 2, 3, 4, 5, 6. A code is considered 'standard' if it contains at least one odd digit and at least one even digit.
What is the number of 'standard' codes that can be produced?
- 1,134
- 1,296
- 1,215
- 162
- 1,040
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