1 and 3
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The factors of 51 are: 1, 3, 17, 51The factors of 75 are: 1, 3, 5, 15, 25, 75The factors of 81 are: 1, 3, 9, 27, 81The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3
The common factors of 36 and 81 are: 1, 3, and 9
Prime: 13, 23, 31 Composite: 15, 18, 51, 66, 81
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Factors of 81 are [3 3 3 3] Factors of 75 are [3 5 5] Common factors [3] ■