题目内容

九宫格，中间的数字是7，右下角数字是11，然后左上到右下三个数和右上到左下三个数的和相同都是s，问s是否是21

1)每一列数字和都是s

2)每一行数字都是s

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AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
CBOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
DEACH statement ALONE is sufficient.
EStatements (1) and (2) TOGETHER are NOT sufficient.

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正确答案: C

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