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Anonymous
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1, 3, 7, and 21 are.
1, 2, 4, 5, 10, and 20
x2-7x+12 (x-3)(x-4)
The common factor of both 15 and 27 is 3.
36=4x9=2x2x3x3, or, if you like, 36=6x6=2x3x2x3