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Finding Factors

1 and are the...

Question

1 and are the common factors of 9 and 21.

A

3

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B

9

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C

21

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Solution

The correct option is A 3
The factors of 9 are : 1, 3 and 9
The factors of 21 are : 1, 3, 7 and 21

Factors 9, 21 and 7 are not common in both numbers 9 and 21. Therefore, the common factors of 9 and 21 are 1 and 3.

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