Premise:
"(Tickets for Gion Corner are usually available through your hotel or the Tourist Information Ceter. )"
Hypothesis: Tickets for Gion Corner can only be purchased online at the institution website.

no

Premise:
"Why would a veteran of this one unit have any basis for knowing the total number of defectors in the entire Vietnam war?"
Hypothesis: Everyone knows that there were no defectors in the Vietnam war.

no

Premise:
"The plantation was bought in 1936 by English industrialist Sir Harold Mitchell and became an important focus for diplomatic, political, and social activities in Jamaica."
Hypothesis: The plantation was was once a place for social activities.
yes