Question

Think about prime numbers and composite numbers.list all the digits that are the last digit of at least one prime number.

Answer 1

1,3,5,7,9

Explanation:

0 can't be, let's take 10 or 20 or 30 for example, not a prime number.

1 can be because let's take 11, 31 as example, they're prime numbers.

2, 4, 6, 8 can't be the answer because they have factors

The rest of off numbers, namely 3,5,7,9 can be. Let's take for example 23, 05, 67, 59