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Omni-MATH / There are 2018 frogs in a pool and there is 1 frog on the shore. In each…

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problem

There are 2018 frogs in a pool and there is 1 frog on the shore. In each time-step thereafter, one random frog moves position. If it was in the pool, it jumps to the shore, and vice versa. Find the expected number of time-steps before all frogs are in the pool for the first time.

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