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HCF(40, 63) = 1
The factors of 105 are 3,5, & 7. The factors of 63 are 3,3, & 7. One lot of '3' and one lot of '7' is common to both numbers. Hence 3 x 7 = 21 , which is the HCF of 105,& 63.
The GCF is 9.
The GCF is 21.
The GCF is 15.