Easy 2 point
            Medium 4 points
            Hard 6 points
            Ninja 10 points
| Question | Type | Level | Solve | 
|---|---|---|---|
| Write a function to find the difference of two sets? | Math | Medium | Solve | 
| Write a function to find complement of a set given the universal set? | Math | Medium | Solve | 
| Write a function to sum the digits of given number? | Number | Medium | Solve | 
| Write a function that returns a nine digit number with condition given in example? | Puzzle | Hard | Solve | 
| Write a function to compute the area of a circle given radius? | Math | Easy | Solve | 
| Write a function to compute the circumference of a circle given radius? | Math | Easy | Solve | 
| Write a function to find the average of the list of numbers? | Math | Medium | Solve | 
| Write a function that checks whether the given number is a perfect number? | Number | Medium | Solve | 
| Write a function to extract numbers from the given string? | String | Medium | Solve | 
| Write a function that returns a list containing all permutations of a given string? | Array | Hard | Solve |