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- 2011-9-2
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1.If x is a positive integer, is the remainder 0 when 3x + 1 is divided by 10? (1)x = 4n + 2, where n is a positive integer. (2)x > 4答案选A 2. If a code word is defined to be a sequence of different letters chosen from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio of the number of 5-letter code words to the number of 4-letter code words?
A.5 to 4 B.3 to 2 C.2 to 1 D.5 to 1 E.6 to 1正确
3. Which of the following fractions has a decimal equivalent that is a terminating decimal? A 10/189 B 15/196 C16/225 D 25/144 E 39/128 有什么好方法可以看出来呢
需要指点 谢谢了
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