Question

The only prime factors of a number n are 2,5,7, and 17 . Which of the following could NOT be a factor of n?
10
20
25
30
34

Answer 1

Explanation also please

Answer 2

If you factorize the options into their prime factors, only 1 of them has a prime factor not on the list.
i.e 10 = 2x5. both 2 and 5 are factors of n, so 10 can be a factor of n

Answer 3

OHHHHh so 30?

Answer 4

right