Prime factors of 18 are 2 and 3
Prime factors of 45 are 3 and 5
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The least common multiple of the numbers 18, 30 and 45 is 90.
3
The greatest prime factor of both numbers is 3
The answer to this problem is simple, the Greatest Common Factor (GCF) is 27.
81=9^29+9=1877=7*117+11=18