管卫东不在博森了吗?为什么?

GWD管卫东 GMAT 第10数学第25 求讲解 先谢过 ……
Q25:
If the sequence x1,x2,x3,…,xn,… is such that x1 = 3 and xn+1 = 2xn – 1 for n ≥ 1,then x20 – x19 =
5个选项分别是 2的19次方,2的20次方,2的21次方,2的20次方-1,2的21次方-1
说什么呢 都不是一道题 10套第25题

GWD管卫东 GMAT 第8套 求讲解 先谢过
Q9:
If an integer n is to be chosen at random from the integers 1 to 96,inclusive,what is the probability that n(n + 1)(n + 2) will be divisible by
A.1/4
B.3/8
C.1/2
D.5/8
E.3/4

我想问下博智的GMAT课四天面授真的有用么?我现在大三,只做了点OG,冲着管卫东的想报个班,过来人说明下
四天怎么上的啊?

GWD管卫东GMAT 第7套题 数学第21题 求讲解 正确答案是E 我觉得C……
Q21:
Theater M has 25 rows with 27 seats in each row.How many of the seats were occupied during a certain show?
(1) During the show,there was an average (arithmetic mean) of 10 unoccupied seats per row for the front 20 rows.
(2) During the show,there was an average (arithmetic mean) of 20 unoccupied seats per row for the back 15 rows.
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.

GWD管卫东GMAT 第7套题 数学第21题 求讲解 谢谢 正确答案是E 我觉得C……
Q21:
Theater M has 25 rows with 27 seats in each row. How many of the seats were occupied during a certain show?
(1) During the show, there was an average (arithmetic mean) of 10 unoccupied seats per row for the front 20 rows.
(2) During the show, there was an average (arithmetic mean) of 20 unoccupied seats per row for the back 15 rows.

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.

求助管卫东语法题一道
GWD7-Q31:Unlike theoriginal National Museum of Science and Technology in Italy, where the modelsare encased in glass or operated only by staff members, the Virtual LeonardoProject, an online version of the museum, encourages visitors to “touch” each exhibit,which thereby activates the animated functions of the piece.A. exhibit, which thereby activatesB. exhibit, in turn an activation ofC. exhibit, and it will activateD. exhibit and thereby activateE. exhibit which, as a result, activates请问这道题which为什么不能够指代exhibit呢？

GMAT GWD管卫东 第四套 要考试了 拜谢!
Q7:
If x(x - 5)(x + 2) = 0,is x negative?
(1)x05 x2 – 7x ≠ 0
(2)x05 x2 –2x –15 ≠ 0
x05
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.
Answer:
我选了B
Q35:
If n is a positive integer,which of the following is a possible value of |56 - 5n|?
A.x057
B.x059
C.x0512
D.x0515
E.x0520
Answer:
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我选了A
这两题都觉得自己是对的啊,其实都是很简单的题,有人帮我看一眼么?

GWD管卫东 GMAT 第8套 数学第29题 求讲解 但是右上角有个※ 是有争议的意思么?
Q29:
The annual rent collected by a corporation from a certain building was x percent more in 1998 than in 1997 and y percent less in 1999 than in 1998.Was the annual rent collected by the corporation from the building more in 1999 than in 1997?
(1) x > y
(2) xy/100 < x – y
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.