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To disprove this all you need to do if find one example of a prime that is not even. Such an example is called a counterexample. If a statement that all such and such or every such and such has a certain property, all you have to do to disprove it it to demonstrate the existence of on such and such that lacks the property .
u cant undo anything
it means no solution. no answer. cant be answered
No, often there is not enough evidence either way.