2. 外语
  3. If y is the average (arithmetic mean) of n consecutive positive integers, n>l, what is the sum of the greatest and least of thes

If y is the average (arithmetic mean) of n consecutive positive integers, n>l, what is the sum of the greatest and least of thes

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问题 If y is the average (arithmetic mean) of n consecutive positive integers, n>l, what is the sum of the greatest and least of these integers?
选项 A、2y
B、ny
C、y/2
D、y/n
E、2n/y
答案A
解析 若y是72个连续正整数(consecutive positive integers)的算术平均数，且n>1，这些数的最大值和最小值的和是多少?
解：本题的正确答案是(A)。连续正整数具有一个特殊的性质，即n个连续正整数的算术平均值为这n个数中最大数与最小数的算术平均值。由此可知，在本题中最小值和最大值的和为这n个数的算术平均值的两倍，即为2y。
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本试题收录于： GRE QUANTITATIVE题库GRE分类
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