1 x 216, 2 x 108, 3 x 72, 4 x 54, 6 x 36, 8 x 27, 9 x 24, 12 x 18, 18 x 12, 24 x 9, 27 x 8, 36 x 6, 54 x 4, 72 x 3, 108 x 2, 216 x 1.
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The factor tree for 216 looks like 2 times 108 2 times 54 2 times 27 9 times 3
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7 x 31 = 217
GCF(217, 411) = 1, the numbers are coprime.
Common factors of 77 and 217 are: 1 and 7.