2. 外语
  3. If n is any prime number greater than 2, which of the following CANNOT be a prime number?

If n is any prime number greater than 2, which of the following CANNOT be a prime number?

admin2009-05-19  35
问题 If n is any prime number greater than 2, which of the following CANNOT be a prime number?
选项 A、n-4
B、n-3
C、n-1
D、n+2
E、n+5
答案E
解析 若n是任一个大于2的质数，下面哪一项不能是质数?
解：本题的正确答案是(E)。考生在解这类数字规律题时应采用排除法，把选项代入逐个排除。(A)9-4=5；(B)14-3=11，(C)3-1=2，(D)3+2=5，(E)无论如何也得不到质数，因为大于2的质数都是奇数，奇数加5必为大于2的偶数，所以，n+5不可能是质数。
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