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The greatest common factor is 6.
30 = 6 x 5
78 = 6 x 13
90 = 6 x 15
180 = 6 x 30
Finding common factors (2 x 3 = 6)
30 = 2 x 3 x 5
78 = 2 x 3 x 13
90 = 2 x 3 x 3 x 5
180 = 2 x 2 x 3 x 3 x 5
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