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Anonymous
The GCF is 3.
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GCF of 6 15 21 and 9 is 3.
The GCF of 9 and 21 is 3.
6 = 2 x 3 9 = 3 x 3 15 = 3 x 5 GCF = 3
The GCF is 3. The LCM is 63.