medium · GMAT Quant
An inventory control system tags storage units across 5 audit steps using Zone 1, Zone 2, or Zone 3. Regulations dictate that Zone 1 cannot immediately follow Zone 1, and Zone 2 cannot immediately follow Zone 2. If Zone 3 cannot be assigned at audit step 1
How many distinct 5-step auditing sequences satisfy these regulations?
- 24
- 48
- 58
- 99
- 162
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