求解狗狗196 小朋友身高问题

Alice13yy · 发表于 2011-1-1 22:14:11

196. ds，一个幼儿园，小盆友Ａ在所有人的65％里面最高，问小盆友Ａ的身高：
（1）其余的（35％）小盆友的最小身高是19；
（2）这65％小盆友中至少一个身高是19。
狗主人表示：我选Ｃ
两个一起为什么充分？

sdcar2010 · 发表于 2011-1-1 22:32:51

Stimulus: A is the tallest among 65% of the students. How tall is A?
1) Among the other 35% of student, the shortest is 19. From this condition, we know that A <=19. A could be 19, or 18, or 17 ... Insufficient.
2) Among the 65% of of student to which A belongs, at least one student is 19. From this condition, we know that A >= 19. A could be 19, or 20, or 21 . . . Insufficient.

1) and 2) A=19. Sufficient.

Alice13yy · 发表于 2011-1-1 22:48:36

Stimulus: A is the tallest among 65% of the students. How tall is A?
1) Among the other 35% of student, the shortest is 19. From this condition, we know that A <=19. A could be 19, or 18, or 17 ... Insufficient.
2) Among the 65% of of student to which A belongs, at least one student is 19. From this condition, we know that A >= 19. A could be 19, or 20, or 21 . . . Insufficient.

1) and 2) A=19. Sufficient.

-- by 会员 sdcar2010 (2011/1/1 22:32:51)

我的疑问就是第一个条件是其他35% 与A无关而且是最小身高为19 那应该有 19 20 21.....
第二个条件至少有一个是19 并没有说比19 大还是比19小
两个是分开来说的感觉1和2 也不充分

lovelysangsang · 发表于 2011-1-1 22:50:53

同意楼主

sdcar2010 · 发表于 2011-1-1 22:54:36

小盆友Ａ在所有人的65％里面最高. Therefore, the other 35% is TALLER than A.

第一个条件是其他35% 与A无关而且是最小身高为19 那应该有 19 20 21.....
So 1) says among ALL the students taller than A, the shortest height is 19. Then A cannot be taller than 19!

第二个条件至少有一个是19 并没有说比19 大还是比19小. Among the 65% to which A belongs, A is the tallest. If one guy among the 65% is 19, A is at least 19,
might be taller but definitely not shorter than that!

Alice13yy · 发表于 2011-1-1 23:13:23

小盆友Ａ在所有人的65％里面最高. Therefore, the other 35% is TALLER than A.

第一个条件是其他35% 与A无关而且是最小身高为19 那应该有 19 20 21.....
So 1) says among ALL the students taller than A, the shortest height is 19. Then A cannot be taller than 19!

第二个条件至少有一个是19 并没有说比19 大还是比19小. Among the 65% to which A belongs, A is the tallest. If one guy among the 65% is 19, A is at least 19, might be taller but not shorter!

-- by 会员 sdcar2010 (2011/1/1 22:54:36)

我终于明白了还是大牛厉害纠结了好久十分感谢啊

Alice13yy · 发表于 2011-1-1 23:14:38

同意楼主

-- by 会员 lovelysangsang (2011/1/1 22:50:53)

同学那个大牛解释的是对的应该是c 是我错了可不要误导你了啊

求解狗狗196 小朋友身高问题

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