gwd上的一道题 大家没怎么讨论过

kelebonnie

gwd6-Q26:
K is a set of integers such that if the integer r is in K, then r + 1 is also in K.  Is 100 in K?
(1)      50 is in K.
(2)      150 is in K.
    
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

答案选的是A  我觉得是D  请教下大家为什么(2）150 is in K. is not sufficient

暮云春树

这个也是本月机经题。

kelebonnie

明白了，灰常感谢ls

Daisy_Chen

既然能判断出100不在，所以才应该选D呀

-- by 会员 kelebonnie (2011/10/13 16:12:19)

可能在可能不再
看这个数列从几开始
没说从150开始

kelebonnie

既然能判断出100不在，所以才应该选D呀

ethanli

r=101, 102,103...149,150时，150在K里面，100不在