medium · GMAT Quant
A cloud database partitions user data using a 4-character routing key composed from K_1, K_2, K_3, K_4, K_5. To prevent bottlenecking, K_1 cannot be used in the first position, and adjacent characters in the key must be different.
How many unique routing keys can be generated?
- 256
- 320
- 500
- 625
- 96
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