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3 and 90
15 and 18
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15 and 90
The set of (90,90) has a GCF and an LCM of 90.The set of (-90,-90) has a GCF and an LCM of 90.
The GCF is: 15The LCM is: 990
18 and 630 respectively
They are 3 and 90 respectively