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This is tricky.
Once you determine that 73 is a Prime number then you can ignore 127 (since 73 is not a factor of 127).
So, the greatest common factor is 1.
Note: if you asked 73 and 146 then the answer would be 73.
Anytime one of the numbers is a prime - then the answer is EITHER 1 or the prime number (if the other number is a multiple of the prime).
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