Question: Develop a java program to define an abstract class Sum containing two abstract methods: int sumoftwo(int, int) int sumofthree(int, int, int) and a regular method,

Develop a java program to define an abstract class Sum containing two abstract methods:

int sumoftwo(int, int)

int sumofthree(int, int, int) and a regular method, void display

Define a class Demo that extends Sum class and implements all the methods. Also, take an example to demonstrate the use of all methods.

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