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Anonymous
6.
42 = 2 x 3 x 7
18 = 2 x 32
72 = 23 x 32
hcf = 2 x 3 = 6
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The GCF is 6.
The GCF of 72, 270 and 810 is: 18
GCF(36, 42, 72) = 6
Since 18 is a factor of 72, it is automatically the GCF.
The GCF is 18.