Marsha adds all but one of the first ten positive integers. Her sum is a square number. Which one of the first ten positive integers did Marsha not include?
Question:
Marsha adds all but one of the first ten positive integers. Her sum is a square number. Which one of the first ten positive integers did Marsha not include?
Answer:
Let's think step by step.

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Marsha adds all but one of the first ten positive integers. Her sum is a square number. Which one of the first ten positive integers did Marsha not include?
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