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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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for all integers n：能够满足所有整数n 不只是0
所有整数不是包括0吗，0*0不也等于0
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
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想b的时候一定独立于a