what is the common factor of 18 and 21
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The factors of 18 are 18, 9, 6, 3, 2, 1. The factors of 21 are 21, 7, 3, 1. The common factors of 18 and 21 are 3,
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FACTORS OF 18 : 1 , 2 , 3 , 6 , 9 , 18
FACTORS OF 21 : 1 , 3 , 7 , 21
∴ Common factors of 21 and 18 are 1 & 3
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