No, 3 is a factor of both. Note that the digits of 120 add up to 3 and those of 147 add up to 12. Both are multiples of 3 so the numbers 120 s and 147 are divisible by 3 and not relatively prime
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No.
No, 120 and 835 are not relatively prime.
No. Two even numbers cannot be relatively prime.
120 and 49
No, it is not a prime. 147=3*7*7.