1, 2, 3, 6, 7, 14, 21, 42
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Besides 1, the number 3 goes into both 9 and 42. 9/3=3 and 42/3=14
1 and 2 both do.
The common factors of 36 and 42 are 1, 2, 3 and 6.
The HCF of both numbers is 1
Their common factors are: 1 and 2.