medium · GMAT Quant
A warehouse generates a 3-digit location key h_1 h_2 h_3 using digits 1, 2, 3, 4, 5 (3 odd digits and 2 even digits). Bins require h_1 and h_3 to be odd digits, and adjacent digits must differ (h_2 ≠ h_1 and h_3 ≠ h_2).
What is the total number of valid location keys?
- 24
- 30
- 36
- 45
- 80
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