Factors are numbers you can multiply together to get another number. Therefore, all the factors of 21 are as follows: 1,3,7,21.
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The factors of 21 are 1, 3, 7, and 21 which means that 21 is composite.
The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42
The factors of 8 are 4x2 and 1x8
All Factors of 142:1, 2, 71, 142
1, 3, 7, 21