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18
The HCF of 4 and 90 is 2.
HCF(36, 50) = 2LCM(36, 50) = 180
The GCF is 9.
The GCF is 12.
The GCF is 4.
The GCF is 18.
The GCF is 30.
It is 36
36
The hcf of 12 & 36 is 12