Help me in solving LB01B problem

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Learning course: Solve Programming problems using Python
Problem Link: Problem (Make Avg) - Generate examples Practice Problem in Solve Programming problems using Python - CodeChef

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@akshitha_5c7

Correct Answer(s):

For A = 3 and C = 4, the output is -1
For A = 3 and C = 5, the output is 4
For A = 2 and C = 4, the output is 3
Explanation:
For A = 3 and C = 4, the output is -1 as the average of 3 and 4 cannot be an integer.    
        
For A = 3 and C = 5, the output is 4 as the average of 3 and 5 is 4 - which is an integer.    
    
For A = 2 and C = 4, the output is 3 as the average of 2 nd 4 is 3 - which is an integer.