Answer:
First we understand what is hash function.A hash function is mostly used in Hashmaps. It maps different keys to a set of values.There may occur a case when we have same key but different values.This case is called collision.So we have to use different collision handling techniques that are open addressing and separate chaining.
A perfect hash function maps key-value pair such that there are no collisions.
 
        
             
        
        
        
Answer:
a. The content that displays in the browser is contained in the head section.
 
        
             
        
        
        
text effects, and typography.
 
        
             
        
        
        
The same thing as if you do it once
        
             
        
        
        
Answer:
The main reason why we use hexadecimal numbers is because it provides a more human-friendly representation and is much easier to express binary number representations in hex than it is in any other base number system. Computers do not actually work in hex. Lets take an example, using a byte.
Hope this answer is right!!