gwd 1-Q10

SMARTCATHY

                

                

                                

                                

                                

Q10:

                        

                        

                        

Q10:

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

Correct answer: D

可是我觉得是C

                

dingle203

LZ把充分和必要性搞搞明白哦

if A,then B 和 if B,then A 是不一样的～

SMARTCATHY

多谢，多谢！

dingle203

以下是引用SMARTCATHY在2008-7-30 14:47:00的发言：

多谢，多谢！

不客气噢

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