HCF Means highest common factor. And a square
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If you mean 91, 156 and 169 then the highest common factor is 13
Yes.First find the HCF of two of the numbers, then find the HCF of that answer and the third number.In this way you could find the HCF of as many numbers as you want.
The GCF is 70.
If you mean 24 and 36 then the HCF is 12
If you mean: 21, 49 and 84 then the HCF is 7