Does the Primary key of a table accept null or duplicate value? Justify.

Identify the Domain name and URL from the following: http://www.income.in/home.aboutus.html

Which of the following cannot be returned by random.randrange(4) ?

1. 0
2. 3
3. 2.3
4. None of these

Find errors (if any) in the following code and rewrite the code underlining each correction:

x = int("Enter value of x:")
for in range[0, 10]:
    if x = y
        print("They are equal") 
    else:
        Print("They are unequal")