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Need a Hint?

HINT: Remember, ALL THREE labels are incorrect (eg: The bucket labeled "Trout" contains either "Salmon" or "Salmon and Trout").

See Answer

ANSWER: Just one.

EXPLANATION: A fisherman need only look at one fish from the bucket labeled "Salmon and Trout". This will lead to one of two scenarios.

Scenario 1: If the fish he looks as it is a salmon, it must be the "Salmon" bucket. It cannot be the "Salmon and Trout" bucket since we know the current labels are incorrect and it's not the "Trout" bucket because the fish he looked at is a salmon. Next, the "Trout" bucket cannot contain only trout since we know the current labels are incorrect, so it must be the "Salmon and Trout" bucket. The remaining bucket, labeled "Salmon", must therefore be the "Trout" bucket.

Scenario 2: If the fish he looks as it is a trout, it must be the "Trout" bucket. It cannot be the "Salmon and Trout" bucket since we know the current labels are incorrect and it's not the "Salmon" bucket because the fish he looked at is a trout. Next, the "Salmon" bucket cannot contain only salmon since we know the current labels are incorrect, so it must be the "Salmon and Trout" bucket. The remaining bucket, labeled "Trout" must therefore be the "Salmon" bucket.

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