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If all the factors are included, the largest number of the set is the composite number for which they are all factors.

1, 3, 5, and 10. The first set would be the set of factors of 10, which are 1, 2, 5, and 10, but this does not match the given numbers, so it is not the one.

1, 4, 7 and 28. The second set would be the set of factors of 28, which are 1, 2, 4, 7, 14, and 28, but this does not match the given numbers, so it is not the one.

1 and 23. The third set represents the factors of a prime number, which does not match the condition of it being a composite number, so it is not the one.

1, 2, 4, 5, 10, and 20. The fourth set represents the factors of 20, which are 1, 2, 4, 5, 10, and 20 - a match for the given numbers, so it is the one that fits the condition.

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16y ago

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