Day 1: Data Types
https://www.hackerrank.com/challenges/30-data-types/problem
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Day 14: Scope
https://www.hackerrank.com/challenges/30-scope/problem
Day 13: Abstract Classes
https://www.hackerrank.com/challenges/30-abstract-classes/problem
Day 12: Inheritance
https://www.hackerrank.com/challenges/30-inheritance/problem
Day 11: 2D Arrays
https://www.hackerrank.com/challenges/30-binary-numbers/problem