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The least common factor of any set of numbers is 1.
The GCF is 3.
21 is a factor of 63 (21 * 3 = 63).71 is a prime number.Since 71 has no common factors with 63, they must be multiplied together to find their least common multiple.Thus, the least common multiple (LCM) of 21, 63 and 71 is 63 * 71 = 4473.
Since 9 is a factor of 63, all of its factors are common.
The greatest common factor is 63