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.
问XY之间有多少个奇数?
条件一: 12个偶数在XY之间,有可能12偶12奇在数列里,偶奇开头都有可能;也可能奇数开头,13奇12偶和11奇12偶的情况,则数列的奇偶数量不确定;不充分;
条件二:24个整数,肯定是12奇12偶,谁先开头都一样,条件二充分;选B
延伸,如果条件二改成XY之间有25个整数;
条件一:同上,不充分;
条件二:存在12奇13偶,或者13奇12偶两种情况。不充分;
1+2,12偶数确定,只有13奇的情况。充分,选C
问XY之间有多少个奇数?
条件一: 12个偶数在XY之间,有可能12偶12奇在数列里,偶奇开头都有可能;也可能奇数开头,13奇12偶和11奇12偶的情况,则数列的奇偶数量不确定;不充分;
条件二:24个整数,肯定是12奇12偶,谁先开头都一样,条件二充分;选B
延伸,如果条件二改成XY之间有25个整数;
条件一:同上,不充分;
条件二:存在12奇13偶,或者13奇12偶两种情况。不充分;
1+2,12偶数确定,只有13奇的情况。充分,选C