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The length of each side of a square in metres is an odd numb

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The length of each side of a square in metres is an odd number.Which one of the following could
possibly be the perimeter of the square?请翻译一下(跟上和下连起来翻译,但我只要一个答案)
正方形的边长是一个奇数.以下哪个数可能是该正方形的周长.
答案:奇数乘以4结果一定是个偶数.