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2, 3 and 73
83, 3,and 2 are prime numbers which add up to 88.
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
11 and 3
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