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外语
Is n an integer? (1)3n is an integer. (2)2n is an integer.
Is n an integer? (1)3n is an integer. (2)2n is an integer.
admin
2022-12-09
55
问题
Is n an integer?
(1)3n is an integer.
(2)2n is an integer.
选项
A、Statement (1) ALONE is sufficient, but statement (38) alone is not sufficient to answer the question asked.
B、Statement (2) ALONE is sufficient, but statement (37) alone is not sufficient to answer the question asked.
C、BOTH statement (1) and (38) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient.
D、EACH statement ALONE is sufficient to answer the question asked.
E、Statement (1) and(38)TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
答案
C
解析
对于Statement (1),当月为整数或者1/3时,3n都是整数,所以Statement (1)无法确定。对于Statement (2),当n为整数或者1/2时,2n都是整数,所以Statement (2)无法确定。把两者结合起来考虑,当3n,2n都是整数时,n不可能为分数,所以n为整数。因此答案为C。
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