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Which concept of OOP allows to create a class which can not be instantiated ?
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Which modification of the following code WILL NOT make the output be "success" ?10
Inheritance in OOP.12
Overrided method visibility must be the same or less restrictive than the inherited method.7
Can a class implements several interfaces ?4
Explain the difference between overriding and overloading in OOP.4
What does the following code return ?5
When can you do a+b in OOP ?