13 caves

Question:

There are about 13 caves arranged in a circle, and one of these caves has treasure of Each day the treasure keepers can move the treasure to the adjacent caves or keep it in the same cave. Every two-day treasure keepers visit the place and have enough time to enter any two caves of their choice __ So how do the treasure seekers can find a treasure in minimum possible days?

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Answer: Seven days.  If one of the treasure seeker moves clockwise every day and one of the seeker’s moves anti-clock wise, they will find a treasure in minimum seven days.