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To get the Greates Common Factor (GCF) of 217 and 522 we need to factor each value first and then we choose all the copies of factors and multiply them:
|217: || || || ||7|| ||31|
|522: ||2||3||3|| ||29|| |
|GCF: || || || || || || |
The Greates Common Factor (GCF) is: 1