Goldbach's conjecture is one of the oldest unsolved problems in number theory and in all of mathematics. It states:
Every even integer greater than 2 can be expressed as the sum of two primes

a counterexample to Goldbach's Conjecture would be
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question
a) an even number that is not the sum of two primes
b) two prime numbers whose sum is odd
c) two prime numbers whose sum is even
d) two odd numbers whose sum is not even
e) two even numbers whose sum is not odd