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Factor out each term to obtain:

27 = 3 x 9

= 3 x 3²

= 3³

30 = 3 x 10

= 3 x 2 x 5

= 2 x 3 x 5

28 = 4 x 7

= 2² x 7

Since all of these terms don't have the common factor, it must be 1!

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12y ago

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