There’s a strategy that always finds a coin. Best, worst and average are one coin.

For the best average expectation, another that finds five coins with probability 12/30 and zero with probability 18/30. Worst case is zero but average is two coins.(Equals another the finds six coins with probability 10/30)

I can also devise a strategy that gets you the jackpot of all ten coins with probability 2/30.

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