Problem Solving
试题详情
题目：
If n > 2, then the sum, S, of the integers from 1 through n can be calculated by the following formula: S = n(n + 1)/2. Which one of the following statements about S must be true?
选项:
A、AS is always odd.
B、BS is always even.
C、CS must be a prime number.
D、DS must not be a prime number.
E、ES must be a perfect square.
答案:
D
提问：
一道机经题：可以通过举例排除条件一，网友讨论说这题选b，想请老师讲解如何理解条件二[img=/uploads/askimgs/gmat-20230406-214437.jpeg]
评分:
0
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4411
提问：
老师 这个98题 感觉没有理解他的话 我理解为4分之3被圈起来 而且不减少宽 来减少长 那么就是长那里取到30 这个围栏被需要怎么是5啊[img=/uploads/askimgs/gmat-20211018-150039.jpg][img=/uploads/askimgs/gmat-20211018-150322.jpg]
评分:
1
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