Final answer:
The king's closing words reveal the irony in Hamlet's decision by emphasizing the contrast between their beliefs.
Step-by-step explanation:
The king's closing words reveal the irony in Hamlet's decision by emphasizing the contrast between their beliefs. While the king believes that Hamlet's encounter with the ghost is merely a figment of his imagination, Hamlet asserts that a significant portion of the population, specifically 'five-and-seventy in one hundred,' have experienced similar encounters. This contrast highlights the irony of Hamlet's decision to pursue the truth while the king dismisses it as foolishness.