All of them. 1,2,5 and 10.
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1, 2, 5, and 10
The factors of 10 are: 1, 2, 5, 10.The factors of 20 are: 1, 2, 4, 5, 10, 20.The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30.The common factors are: 1, 2, 5, 10.
The factors of 30 that are not prime numbers are 6, 10 and 30.
The common factors of 10 and 30 are: 1, 2, 5, and 10 Btw, this exact answer was the first response to a google search of "common factors".
The factors of 30 are... 1, 2, 3, 5, 6, 10, 15, and 30