Set S consists of the integers of the form $$r2+s$$, where r and

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Set S consists of the integers of the form $$r2+s$$, where r and s are integers such that $$1≤ r ≤ 5$$ and $$1≤ s ≤ 5$$. How many integers in S are odd?

答案：C

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老师这题请问为什么不选D呀？

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