1,2,3,4,5,6,10,11,12,15,20,22,30,33,44,55,60,66,110,132,165,220,330,660
1,3,5,7,11,15,21,33,35,55,77,105,165,231,385,1155
Common set:
1,3,5,11,33,55,165
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Common factors of 2850 and 1155 are: 1, 3, 5, and 15.
As a product of its prime factors: 3*5*7*11 = 1155. From the given information its factors can be worked out and that 1 and 1155 are also factors
The factors of 660 are 1, 2, 3, 4, 5, 6, 10, 11, 12, 15, 20, 22, 30, 33, 44, 55, 60, 66, 110, 132, 165, 220, 330, 660. For them to be common, they need to be compared to another set of factors. If that's 6 and 60, the common factors are 1, 2, 3 and 6.
The factors of 1155 are 1, 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 165, 231, 385, and 1155. The prime factorsof 1155 are 3 x 5 x 7 x 11.
1155 = 3 x 5 x 7 x 11