GMAT考试中余数问题,提问GMAT余数题，实在数学差，希望指点！

2024-01-19 01:20分类： GMAT考试阅读：

1、提问GMAT余数题，实在数学差，希望指点！

If n is a positive integer and r is the remainder when (n-1)*(n+1) is divided by 24, what is the value of r?

1. 2 is not a factor of n.

2. 3 is not a factor of n.

请问这题思路是什么啊？怎么利用那两个条件，我完全无从下手

GMAT考试中余数问题,提问GMAT余数题，实在数学差，希望指点！

2、GMAT两道数学题

Q1:

If $1,000 will be deposited in a bank account and I is the dollar amount of interest earned from the original deposit, represented as I = 1000 {(1 + r/100)n – 1}, and the annual interest rate is r percent, is r > 8 percent?

(1) The deposit earns a total of $210 in interest in the first 2 years.

(2) (1 + r/100)2 > 1.15

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案为D，我不明白（2）为什么能推出结论。

If n is a positive integer, what is the remainder when (74n + 3)(6n) is divided by 10 ?

A. 1

B. 2

C. 4

D. 6

E. 8

答案为E

Q3:

A certain list consists of 3 different numbers. Does the median of the 3 numbers equal the average (arithmetic mean) of the 3 numbers?

(1) The range of the 3 numbers is equal to twice the difference between the greatest number and the median.

(2) The sum of the 3 numbers is equal to 3 times one of the numbers.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient

答案为D，我不明白为什么（2）能推出结论。

希望给出详细解答，十分感谢了！！！！！！！

GMAT考试中余数问题,提问GMAT余数题，实在数学差，希望指点！

3、GMAT DS的关于余数的题目

n是整数，问n被15除的余数r=？

条件1：n除5余4

条件2：n除6余5

单独的条件一或二肯定不充分，

于是我是列出4 9 14 19 24 29...

以及5 11 17 23 29 35...

之后又29 59 89...除以十五余数都为14.

我想问下：

1、这种题目有什么简单的方法吗？

2、类似的关于余数的问题有没有什么通用的方法或经验可以分享的请赐教。

4、GMAT题目：请问这个the remainder是什么？下面些式子我看不懂，求解答！

题目是如果俩正整数s/t=64.12,请问whichofthefollowingcouldbetheremainderwhensisdividedbyt? A.2B.4C.8D.20E.45

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