Answer :

the HCF of 12 and 28 -
factors of 12 are 1,2,3,4,6 and 12
factors of 28 are 1,2,4,7,14 and 28
 THE COMMON FACTORS- 1,2 and 4 
HCF= 4
The HCF  of 12 & 28 is 4

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