Answer:
16
Step-by-step explanation:
Express each number as a product of it's prime factors
128 = [tex]2^{7}[/tex]
192 = [tex]2^{6}[/tex] × 3
80 = [tex]2^{4}[/tex] × 5
Identify those prime factors that the numbers have in common and multiply them.
The common factor of all 3 numbers is [tex]2^{4}[/tex]
HCF = [tex]2^{4}[/tex] = 16
