To be relatively prime you must relate the number to another number.
125 is 5³ so it is relatively prime to all numbers that are not multiples of 5 (do not end in 0 or 5)
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Prime factorization of each: 84 = 22*3*7 125=53 So, these numbers are relatively prime and GCF=1.
No, they are not relatively prime.
It can be. 26 is relatively prime to 27. 26 is not relatively prime to 34.
25 is relatively prime with 36. 25 is not relatively prime with 35.
The prime factors of 125 are 5x5x5 or 53.