Question: Three hundred little plastic yellow ducks are dumped in a pond; one of them contains a prize stamped on the bottom. Leonardo examines each duck

Three hundred little plastic yellow ducks are dumped in a pond; one of them contains a prize stamped on the bottom. Leonardo examines each duck until he discovers the prize. He discards each duck without a prize after he checks it, so that he never needs to check a duck more than one time. How many ducks does he expect to check until he discovers the prize?

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