Answer :
Final answer:
The highest common factor (HCF) of two relatively prime numbers is always 1.
Explanation:
The product of two relatively prime numbers is equal to the product of their highest common factor (HCF) and their lowest common multiple (LCM). If the product of two relatively prime numbers is 143, then the HCF of these numbers will be 1. This is because 1 is the only common factor of two relatively prime numbers. Therefore, the correct option is a) 1.
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