Is z equal to the median of the three positive integers x, y, and z ?
(1) x < y + z
(2) y = z
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.
【中位数属性】
x、y、z是三个正整数,问z是否等于这三个数的中位数,中位数是这三个数从小到大排列,位于中间的那个数。
条件1 ,x < y + z,无法确定三个数之间的大小,不充分,如x=2,y=3,z=1,中位数是x;如x=1,y=2,z=3,中位数是y;如x=1,y=3,z=2,则中位数是z.
条件2 y=z ,无论x大于这两个数还是小于这两个数,z都是中位数,充分。