18 = 2 x 32 and 55 = 5 x 11 so yes it is.
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55 and 72 are relatively prime because they have no prime factors in common.
No.
Yes
Any odd prime number.
No. Both 18 and 33 can be divided by 3, which means that they are not relatively prime.(TIP When someone asks you if the numbers are relatively prime think of a number that both numbers can be divided by to get a whole number. With that you should be able too see strait away which numbersare relatively prime.)(Relatively prime means any amount of numbers that can only be divided by 1 and themselves )Hope I helped! :) XD