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Which of the following lists does not include all the factors of the number?4: 1, 2,410: 1, 2, 5, 105: 1,521: 1, 21

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The factors of a number are numbers that can divide the number without leaving any remainder.

Let's check the following numbers given.

Factors of 4 are:

1, 2, and 4 (This list includes all the factors of 4)

Factors of 10:

1, 2, 5, and 10 (This list includes all the factors of 10)

Factors of 5:

1 and 5 (This list includes all the factors of 5)

Factors of 21:

1, 3, 7, and 21.

We can see the list given 1 and 21 does not include all the factors of 21.

ANSWER:

21: 1, 21

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