what is the greatest common factor of 89, 113, 73

Factors of $${\mathtt{89}}$$ : $${\mathtt{1}}$$  , $${\mathtt{89}}$$

Factors of $${\mathtt{113}}$$ : $${\mathtt{1}}$$  , $${\mathtt{113}}$$

Factors of $${\mathtt{73}}$$ : $${\mathtt{1}}$$  , $${\mathtt{73}}$$

The number they all have in common is $${\mathtt{1}}$$  which means the greatest common factor of $${\mathtt{89}}$$ , $${\mathtt{113}}$$ , and $${\mathtt{73}}$$  is $${\mathtt{1}}$$ .

Since 89, 113, and 73 are all prime numbers, their greatest common factor is 1.