Java Programmin Programming and Technical Programming

find the sum of prime number between 1000000000000 and 1000000100000

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Java Programmin Other Question

I cannot use final and abstract together. Why so? which of the given options refers to data encapsulation in oops ?
1 .the data and operation for an object are defind and fixed.
2.data of an object is encapsulated in its class
3. data is hidden for an object
4. a class can have multiple objects