Q10:

A set of numbers has the property that for any number t in the set, t + 2 is in the set.  If –1 is in the set, which of the following must also be in the set?

I.                    -3

II.                 1

III.               5

A.          I only

B.          II only

C.          I and II only

D.          II and III only

E.          I, II, and III

Q25:

A photographer will arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row.  The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her.  How many such arrangements of the 6 people are possible?

A.     5

B.      6

C.      9

D.     24

E.      36

Q30:

Joanna bought only $0.15 stamps and $0.29 stamps.  How many $0.15 stamps did she buy?

(1)   She bought $4.40 worth of stamps.

(2)   She bought an equal number of $0.15 stamps and $0.29 stamps.

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.

那个……第1题是OG哪道题阿？我怎么记得是E

Q1.人家说 “any number t in the set, t + 2 is in the set”没有说“t + 2 is in the set，any number t in the set.”.所以，只能往前推，不能往后推。

Q2. 为了便于理解，把他们的身高定为123456，那么所有的排列组合只有以下5种：（分数线上面为第二行，下面为第一行）

456/123，356/124，346/125，256/134，246/135

Q3.我也觉得statement2 不sufficient～～～

agree!