The function f is defined for all positive integers n by the following rule: f[n] is the number of positive integers each of which is less than n other than 1. If f is any prime number, the f[p] =
A. P-1
B. P+1
C. (P-1)/2
D. (P+1)/2
E. 2 ANSWER : A
看不懂题目中间定义f[n]的那句话,我打了下划线的, 请教解题思路,谢谢
题目的意思是:
F[N]是所有小于N(不包括1)的整数的集合
所以选择A
还是不理解这个题,和 质数 PRIME NUMBER有什么关系呢? F[P]=P-1的话
P=5 的时候F[P]是4 不是质数啊
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