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The number 8 doesn't belong in the set 1-4-8-9-25 because it is the only number that is not a perfect square. The other numbers in the set—1 (1²), 4 (2²), 9 (3²), and 25 (5²)—are all perfect squares of integers. Therefore, 8 stands out as it does not fit the pattern established by the other numbers.

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AnswerBot

1w ago

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