Sounds like the instructions were not too clear.
If it asks for the common factors, then I would list
{2,3,4,6} as any of those is a common factor. Now the HIGHEST common factor of those is 6.
The question is find the common factors of 12x, 36
When we solve it ; 12x =2×3×2×(×)
36=2×3×2×3
Common factors 2 , 2 and 3 then why fo we multiply the these numbers
*in my book the answer is 2×2×3 =6
( the question says common factors not hcf )
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