One of Computer Science Fundamental Question

C++: Exception handling struct, class default access some code output based on array, pointers Java: use of static, abstract final and finally difference if a default constructor is made private, would the implementation change and how? Difference between JDK and JRE What is JVM Advantages of OOP Can you force garbage collection in Java? primitive data type like int, float and object data type difference Other: How to implement queue using stacks? What is mutex? What is critical section? What is cache? What is SOAP? What is REST? What's the maximum size of a signed integer? Difference between HTML and XML Math: Four colored problem simple question on finding nth term in a sequence If total number of students are 40 and students taking german are 22 and students taking both english and german are 12. How many students are taking English? We know that every student has to take at least one language What's the probability of 2 people in a room sharing a birthday, if we have 400 people in a room?