Question

Which of the following is not true?

5 and 7 are the only prime factors of thirty-five.
The prime factorization of eighteen is 2 times 9.
2 is the only prime factor of 8.
The prime factorization of twelve is 2 squared times 3.

Answer 1

The prime factorization of eighteen is 2 times 9. This is not true, as 9 can be further factorised into 3 x 3.