AMC8 1991
AMC8 1991 · Q6
AMC8 1991 · Q6. It mainly tests Logic puzzles.
Which number in the array below is both the largest in its column and smallest in its row? (columns go up and down, rows go right and left.)
下面数组中，哪个数字既是其列中最大的，又是其行中最小的？（列上下，行左右。）
(A)
1
1
(B)
6
6
(C)
7
7
(D)
12
12
(E)
15
15
Answer
Correct choice: (C)
正确答案：（C）
Solution
First mark the largest number in each column. Only 7 is the smallest in its row. (Note: One could also begin by finding the smallest number in each row. Then a check of the columns yields the answer 7.)
首先标记每列中最大的数字。只有 7 是其行中最小的。（注：也可以先找每行中最小的数字，然后检查列，得出答案 7。）
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