作者cline (cline)
看板GRE_Verbal
标题[问题]一题计量请教
时间Sun May 27 21:54:36 2007
If n is any prime number greater than 2, which of the following CANNOT be a
prime number?
a. n-4
b. n-3
c. n-1
d. n+2
e. n+5
答案是 e, 请问如何解?谢谢!!
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