(1,108), (2,54), (3,36), (4,27), (6,18) and (9,12)
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Since 36 is a factor of 108, all of its factors are common.
164,182,241,4
No, you should continue checking for factor pairs even if you find a pair that repeats. A repeating pair indicates that the number is not a prime number, but there may be other factor pairs that have not been identified yet. It is important to exhaust all possible factor pairs to ensure that all factors of the number are identified accurately.
Since 108 is a factor of 432, it is automatically the GCF.