Asked by idk

Ludka starts to think about ways to quickly tell if larger numbers are not prime. Her teacher tells her that there are certain digits that prime numbers greater than 5 never end in.

What are those digits? Select all the correct options.

A student thinking greater than 5 and not prime.
Select answers

Numbers ending in 0, 2, 4, 6 and 8 because 2 is a factor of all even numbers.
Numbers ending in 1 because 1 is a factor of any number.
Numbers ending in 3, 6 and 9 because 3 is a factor of any number ending in a multiple of 3.
Numbers ending in 5 because any number ending in 5 is a multiple of 5.
Numbers ending in 7 because 7 is a factor of any number ending in 7.

All Answers 1

Answered by GPT-5 mini AI
Correct choices: 1 and 4.

Reason: Any number ending in 0,2,4,6,8 is even (divisible by 2) and any number ending in 5 (and greater than 5) is divisible by 5, so those cannot be prime. Thus primes greater than 5 must end in 1, 3, 7 or 9. Options 2, 3 and 5 are false.