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Two numbers are relatively prime (co-prime) if they have no common factor other than 1; that is their highest common factor (hcf) is 1. If one of the numbers is prime, then the two are relatively prime if the prime is not a factor of the other.
11 is a prime. If 11 divides into 181345913, then their hcf is 11 and the two are NOT relatively prime. If 11 does not divide into 181345913 then their hcf is 1 and they are co-prime.
A simple test for divisibility by 11:
Sum of digits in odd position: 1+1+4+9+3 = 18
Sum of digits in even position: 8+3+5+1 = 17
Difference between the two sums = 18-17 = 1
If this difference is divisible by 11 then so is the original number. The difference is not so 11 is not a factor of 181345913 and the two numbers are relatively prime.
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Are 11 and 51 relatively prime?
Yes, 11 and 51 are relatively prime.
Is 11 relatively prime?
11 is a prime number. For it to be relatively prime, it needs to be compared to another integer.
Is number 11 relatively prime with 110?
11 and 110 are not relatively prime because they have 11 as a common factor.
Is 55 relatively prime to 11?
No.
Is 11 relatively prime with 22?
No because their greatest common factor ( gcf ) is greater than one their gcf is 11 therefore 11 and 22 are not relatively prime
