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Each participant in a certain study was assigned a sequence of 3 different letters from the set {A, B, C, D, E, F, G, H}.If no sequence was assigned to more than one participant and if 36 of the possible sequences were not assigned, what was the number of participants in the study?(Note, for example, that the sequence A, B, C is different from the sequence C, B, A.)
A.20
B.92
C.300
D.372
E.476
请牛牛帮忙用中文解释一下
In the decimal representation of x, where 0 < x < 1, is the tenths digit if x nonzero?
(1)16x is an integer.
(2)8x is an integer.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
In the decimal representation of x, where 0 < x < 1, is the tenths digit if x nonzero?
(1)16x is an integer.
(2)8x is an integer.
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient. |
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发表于 2011-2-16 16:21:40
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