Take the following as truth: But, as it will never do if John, too, can prove an alibi, she writes him an anonymous note ”still copying his hand-writing  ”which takes him to a remote spot where it is exceedingly unlikely that anyone will see him. 
Then the following statement: "John can prove his alibi, even though no one could see him." is true, false, or inconclusive?
Answer: Inconclusive