medium · GMAT Quant
A logistics hub routes delivery trucks through a numbered route sequence a_n governed by a_n+1 = (a_n + 7) pmod12, where a_1 = 4 represents the starting hub terminal. If terminal index 0 corresponds to terminal 12, after
How many routing updates will a truck first return to terminal a_1 = 4?
- 12
- 7
- 13
- 5
- 84
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