数学 郁闷 求高手解释

yayajiaojef

此题为GMATpre(TM)模考软件上的题，答案为B，本人选C，请高手解释谢谢

How many odd integers are greater than the integer X and less than the integer Y?

(1)there are 12 even integers greater than X and less than Y

(2)there are 24 integers greater than X and less than Y

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

EACH statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are NOT sufficient.

huangsiyan

一共有24个数在大于X，小于Y的范围内，一定是12个奇数，12个偶数，得出答案为12。假设一共是23或25个数，则奇偶数不定。期待有NN指教~

yayajiaojef

明白了，谢谢