GWD的两题不大明白

zwjb828

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
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.
两题的答案看起来都让我觉得有点玄乎...
第10题的答案是D的说，但是我觉得可以选E呢。因为t+2=-1的话，那-3就可以存在了呀~

zwjb828

呃，不好意思，手按得太快，就发送出去了~
第30题的答案是D，condition（1）我能理解，那么condition（2）呢？
求高人指点~~

zy89111

第1题个人理解是，只能正着推，不能倒回来推。
T是条件,T+2是个结果。
个人理解，仅供参考

小货舱

30题的（2) ,除非这个number指的是金额，否则我也觉得不对，应该选A

jackraywen

30题答案不是D吧。。。Prep上给的答案是A

小货舱

是么 看来GWD的答案错误率还不是盖的。

A就对了

zwjb828

是吗？那就好...多谢多谢