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It is: 1
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The HCF of 25 and 50 is... 25.
25
It is: 27
27
The HCF is 5.
The GCF is 25.
The GCF is 1.
Since 25 and 27 are coprime, any third number - even if it shares a factor with one of these numbers - is bound to form a triplet whose HCF is 1.
The GCF is 27.
Factors of 16 are 1,2,4,8 & 16... Factors of 25 are 1,5 & 25. Therefore the HCF is 1 !