SAT数学试题If n is any prime number greater than 2,which of the followying CANNOT be a prime numberA n-4B n-3C n-1D n+2E n+5

SAT数学试题If n is any prime number greater than 2,which of the followying CANNOT be a prime numberA n-4B n-3C n-1D n+2E n+5
SAT数学试题
If n is any prime number greater than 2,which of the followying CANNOT be a prime number
A n-4
B n-3
C n-1
D n+2
E n+5

SAT数学试题If n is any prime number greater than 2,which of the followying CANNOT be a prime numberA n-4B n-3C n-1D n+2E n+5
这里prime number是素数的意思,n是比2大的素数,那么必然为奇数,n+5为大于2的偶数,必为合数

当n=5时，n+5=10,有1,2,5,10四个约数，不是质数，所以E错误。