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n is a positive integer.
$$n^{2}+2n$$ is even.
Quantity A:$$(-1)^{n}$$
Quantity B:$$(-1)^{n-1}$$
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A.Quantity A is greater.
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B.Quantity B is greater.
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C. The two quantities are equal.
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D.The relationship cannot be determined from the information given.
A显示答案
