Every number is a and a of itself.

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Detailed Solution

Every number is a factor and a multiple of itself.
We know that every number is a multiple of itself.
For example,

1 \times 3 = 3 .

Also, we know that the product of factors is always multiple of numbers.
So, we can say that every number is a factor and a multiple of itself.
Therefore, option 1) is correct.

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