The common factors of 15 and 25 is:

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The common factors of 15 and 25 is:

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1 and 5

1 and 4

1 and 3

1 and 2

answer is A.

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Detailed Solution

Concept- We list all the components that each of the two numbers has, followed by the common factors that both of the numbers have.A number that entirely divides a given number is a factor of that number. The provided number is always a multiple of its component, thus we can also state that. 1 is the common factor for all numbers.Additionally, the number is a component of itself. For instance, 17 possesses both components 1 and 17.
Factors of

Factors of

Common factors

.
So, the required factors are 1 and 5.
Hence, the correct option is 1.

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