easy · GMAT Quant
A manufacturing machine operates across 4 consecutive shifts. Each shift can be set to High-speed (H), Low-speed (L), or Idle (I). To prevent overheating, High-speed (H) cannot be selected for two consecutive shifts.
How many valid 4-shift operational schedules can be created starting from any setting on shift 1?
- 81
- 60
- 54
- 45
- 36
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