Common factors for 315 are 1,3,5,7,9,15,21,35,45,63,105,315

If you are asking for common factors of 3 and 15 than

common factor is 3

Common factors for 315 are 1,3,5,7,9,15,21,35,45,63,105,315

If you are asking for common factors of 3 and 15 than

common factor is 3

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