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C++ : Combinations that express n as a sum of two prime
C++ Exercises, Practice and Solution: An even number of 4 or more can be represented by the sum of two prime numbers. This is called Goldbach expectation, and it is confirmed that it is correct up to a considerably large number by computer calculation. For example, 10 can be expressed as the sum of two prime numbers 7 + 3, 5 + 5. Write a C++ program that accept an integer (n) from the user and outputs the number of combinations that express n as a sum of two prime numbers.
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