Question

11. The HCF of 221 and 391 is 17.
Explain why 221 and 391 cannot be prime numbers.

12. Find two numbers that are not prime and have a HCF of 1.

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Answer 1

Answer:

4 and 9

Step-by-step explanation:

because

4=2×2×1

9=1×3×3

HCF is 1

and they are not prime numbers...