Recourse to ignorance is a logical fallacy. It means that people specify that something is right, just because it hasn't been proven wrong, or it has been concluded that something is wrong, just because it hasn't been proven right. According to the above definitions, Which of the following fall into ignorance:. ['Since authoritative experts say you are wrong, you are likely to be really wrong.', 'You lack evidence to prove that you are not on-site, so you must be on site.', 'You cannot prove that ghosts do not exist, so ghosts do not exist.', 'Many people claim that they have seen ghosts so ghosts exist.']