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Anonymous
This is the way to do it..
Factorize 4,28 using prime numbers only (Prime factorization) till you get 1,1.
The prime numbers used are 2,2 & 7
Therefore HCF(4,28)= 2*2*7 = 28.
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4.
4
If you mean 28, 49 and 84 then the hcf is 7
HCF(308, 420) = 28.
28