Respuesta :

Answer:

1

Step-by-step explanation:

Listing the factors of the 4 numbers

factors of 3 : 1, 3

factors of 5 : 1, 5

factors of 9 : 1, 3, 9

factors of 15 ; 1, 3, 5, 15

The common factor is 1

Thus the HCF is 1

Numbers which have no common factor other than 1 are said to be co- prime

Answer:

1.

Step-by-step explanation:

There is no common factor except 1.

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