5, 6, 10, 15, and 30 are all factors of 30 that are greater than 3 .
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15 is a number greater than 10 and a factor of 30.
No. All factors of a number are less than or equal to it. Therefore the highest factor of 12 is 12. The common factor of 12 with any other number (greater than) 12 cannot be greater than the highest factor of 12 which is 12. Thus no. [The hcf(12, 30) = 6.]
5, 6, 10, 15, 30
It is: 31
24 and 25 are relatively prime because they have no common factor greater than 1. Each of the other number pairs in the question has a common factor greater than 1.