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题库 / Prep2007E1-DS-178
If there are more than two numbers in a certain list, is each of the numbers in the list equal to 0 ?
(1) The product of any two numbers in the list is equal to 0.
(2) The sum of any two numbers in the list is equal to 0.
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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任意两个数相乘 积为0 如果只有3个数的话 0，-1，0 也符合题意 但并不是每一个数都为0 不充分
这里强调任意！！就是每个数都是零（2）不存在 -1，1，-2，2 因为不是任意两个相加都等于0
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