Events with probability 1
1.sun will rise in the east.
this has probability 1 because its a sure event.as sun will only rise in the east its definetely true.and as its true,it has probability 1.
events with probability 0
1.sun will rise in the west
this has probability 0 because its an impossible event.sun will only rise in the east whatever the reason might be .and as its false and will never happen,it has probability 0.