Question

Which of the following are not prime factors of $63$?

• A. $3\times 3\times 7$
• B. $7\times 9$
• C. $3\times 21$
• D. $1\times 63$
• E. $7\times 21$
• F. $9\times 21$
• G. $3\times 7\times 3$
• H. $7\times 3\times 3$

Answer 1

Answer: (B), (C), (D), (E), (F)

$9\times 21$