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To get the Greates Common Factor (GCF) of 2020 and 2019 we need to factor each value first and then we choose all the copies of factors and multiply them:
|2020: ||2||2|| ||5||101|| |
|2019: || || ||3|| || ||673|
|GCF: || || || || || || |
The Greates Common Factor (GCF) is: 1