0
Anonymous
The factor tree for 216 looks like 2 times 108 2 times 54 2 times 27 9 times 3
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2180
1090,2
545,2,2
109,5,2,2
/ \
2 1090
2 545
5 109
217
7,31
247,119,13
The GCF is 7.
83 is prime. No tree.
1, 3, 9, 23, 69, 207. (1 x 207, 3 x 69, 9 x 23)
234 117,2 39,3,2 13,3,3,2