gmat数学表达the reciprocal of r is equal to the sum of the recip

GWD GMAT数学 If m lies between the integers pand s on the number line shown
׀ ׀ ׀ ׀ ׀
2 p s 6
If m lies between the integers pand s on the number line shown, which of the following is a possiblevalue for m?

A. √17
B. √4
C. 2.9
D. 20/4
E. 10/3
A为什么错啊
谢谢

gmat数学求解
1. for any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2. what is the sum of all the even integers between 99 and 301?
A 10,100
B 20,200
C 22,650
D 40,200
E 45,150

GMAT数学
From a group of 3 boys and 3 girls, 4 children are to be randomly selected. What is the probability that equal numbers of boys and girls will be selected?
A. 1/10
B. 4/9
C. 1/2
D. 3/5
E. 2/3

GMAT数学
Joshua and Jose work at an auto repair center with four other workers.For a survey on a healthcare insurance,2 of the 6 workers will be randomly chosen to be interviewed.What is the probability that Joshua and Jose will be both chosen?
A和B在同一家修理中心工作,这家修理中心一共有6人,一个健康报告的采访将会随机采访两个人,请问AB被同时采访的几率是多少?
同上只有A或者B才采访到的几率是多少?
A和B都没被采访到的几率多少?
我太痛苦了,每次做完了以为会了,下次碰到另外一种变体又不会做.怎么才会学会做这类型的题目呢
方法啊 思路啊 我是要去考试啊

GMAT数学求救,
what is the digit to the right of the decimal point in the decimal form of 6/11

GMAT数学求解
If x, y, z areinteger and xy+z is an odd integer, is x an even integer?
1) xy+xz is an even integer
2) y+xz is an odd integer

GMAT数学
What is the remainder when the two-digit,positive integer x is divided by 3
(1) The sum of the digits of x is 5.
(2) The remainder when x is divided by 9 is 5.
还有一道
A school administrator will assign each student in a group of n students to one of m classrooms.If 3 < m < 13 < n,is it possible to assign each of the n students to one of the m classrooms so that each classroom has the same number of students assigned to it?
(1) It is possible to assign each of 3n students to one of m classrooms so that each classroom has the same number of students assigned to it.
(2) It is possible to assign each of 13n students to one of m classrooms so that each classroom has the same number of students assigned to it.

GMAT数学 Tanya prepared 4 different letters to be sent to 4 different addresses.
Tanya prepared 4 different letters to be sent to 4 different addresses.For each letter,she prepared an envelope with its correct address.If the 4 letters are to be put into the 4 envelopes at random,what is the probability that only 1 letter will be put into the envelope with its correct address?
我不需要翻译，只想知道本题的答案是什么。

GMAT数学计算
On July 1,1982,Ms Fox deposited $10000 in a new account at the annual interest rate of 12 percent compounded monthly.If no additional deposits or withdrawals were made and if interest was credited on the last day of each month,what was the amount of money in the account of money in the account on September 1,1982?希望能够有结果和计算过程.另外再问一下知道年利率如何计算复合的月利率?

跪求高手解答GMAT数学
1.the arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5 respectively. What value is exactly 2 standard deviation less than the mean?
2.If K is a positive integer, is k the square of an integer?
(1)k is divisible by 4
(2)k is divisible by exactly four different prime numbers