Premise: "The six people are in a blue raft in the water and one person flew out of the raft."\nHypothesis: "Some people are rafting down dangerous rapids."\nDo we know that the hypothesis entailed by the premise?
Let's think step by step below.
it is not possible to tell
Not everyone on a waterborne raft that flies out of the raft are on dangerous rapids.

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The answer: it is not possible to tell