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题库 / Prep2007E2-DS-198
If @ denotes one of the four arithmetic operations addition, subtraction, multiplication and division, what is the value of 1 @ 2 ?
(1) n @ 0 = n for all integers n.
(2) n @ n = 0 for all integers n.
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.
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题目的意思是MUST be true for all integers, 所以如果0*0可以，但是1*1不行的话，乘法就不行登录 或 注册 后可以参加讨论