Why don't you list some of the primes, e.g.
7,11,13,17,19, 23, 29, 31 ....
notice it is not possible for any of these primes to be even
or have a 0, or 5.
That leaves 1,3, 7, or 9
For a prime number greater than 5, what can the last digit be
? Explain your answer.
3 answers
Nice Question .I have clear
I know that the answer is 1,3,7 and 9 but I need explaination.
1 answer