Yes.
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30 / 2 = 15 15 / 3 = 5
the factor tree of 9 is 3 squared, or 3 x 3. 9 breaks down into 3 and 3.
30 / \ 2 15 / / \ 1*2 5*3 2*5*3
Factor tree for 51: 51 * 1 or 17 * 3 Factor tree for 255: 255 * 1 or 51 * 5
No. 6 is not a factor of 15. The greatest common factor of 15 and 18 is 3.