Option A
The greatest common factor is 4ab
<em><u>Solution:</u></em>
Given that,
We have to find the greatest common factor
![12ab^2c^4+20a^4bc^3+16a^3b](https://tex.z-dn.net/?f=12ab%5E2c%5E4%2B20a%5E4bc%5E3%2B16a%5E3b)
<em><u>First find the GCF of numbers</u></em>
GCF of 12, 20, 16
The factors of 12 are: 1, 2, 3, 4, 6, 12
The factors of 16 are: 1, 2, 4, 8, 16
The factors of 20 are: 1, 2, 4, 5, 10, 20
Then the greatest common factor is 4
<em><u>Now find the GCF of variables</u></em>
![ab^2c^4\\\\a^4bc^3\\\\a^3b](https://tex.z-dn.net/?f=ab%5E2c%5E4%5C%5C%5C%5Ca%5E4bc%5E3%5C%5C%5C%5Ca%5E3b)
Here,
ab is the greatest common factor
Therefore, GCF of variables is ab
Thus, GCF of given expression is: 4ab