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3.
9= 3x3 12= 2x2x2x2x3 HCF = 3
3
The HCF is 4. 16/4 is 4, 12/4 is 3
The GCF is 3.
lcm(9, 12) = 36; hcf(9, 12) = 3.
3 and 12
HCF(9, 12) = 3