They are called relatively prime, or co-prime.
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No, the only way the GCF and LCM of two numbers can be the same is if the numbers are the same.
When that number is a factor of the greater one.
Yes, but only if they are the same number.
Any two composite numbers who do not share the same prime factors.15 = 5x322 = 11x2So 15 and 22 have a GCF of 1
Yes, they can. It should be noted that for such pairs of numbers, the LCM and GCF will always be the same, and always will be the lowest of the numbers. 6 and 12 are a good example; both have a GCF of 6 and a LCM of 6. not true. 2 numbers can't have the same gcf and lcm.