hard · GMAT Quant
An AI agent processes a sequence of 4 operational signals. For each signal, the agent must output a tag: Green (G), Yellow (Y), or Red (R). A sequence is invalid if it contains the tag R more than once or if the tag Y appears in the first position.
How many valid 4-signal sequences can be generated?
- 28
- 48
- 16
- 32
- 81
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