hard · GMAT Quant
A robotic assembly line processes a batch of 5 operations, choosing among Assembly (A), Testing (T), Calibration (C), or Idle (I). The operations must obey the following conditions:
1. Calibration (C) cannot occur on two consecutive operations.
2. Testing (T) can only occur immediately following A or T.
3. Idle (I) cannot be the first or last operation.
4. A has no restrictions.
How many valid 5-operation sequences can be scheduled?
- 124
- 136
- 142
- 158
- 164
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