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x is the sum of the first 25 positive even integers, y is the sum of the first 2
x is the sum of the first 25 positive even integers, y is the sum of the first 2
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2025-02-24
31
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问题
x is the sum of the first 25 positive even integers, y is the sum of the first 25 positive odd integers.
Column A Column B
x y+25
选项
A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given
答案
C
解析
x是前25个正偶数(positive even integer)之和,y是前25个正奇数(positive odd integer)之和。
解:本题的正确答案为(C)。由第n个偶数总比第n个奇数多1(n为正整数),可知前25个正偶数之和比前25个正奇数之和大25。
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