Four speed skaters, marco, naim oliver and pedro, compete in a relay race where they all agree that naim will be the last
skater. then, they try to decide whether or not oliver should be the first skater in the race
which subset, a. of the sample space shows the complement of the event in which oliver is the first skater in the race?
a (mopn, pmon)
a(opmn, ompn)
a = {mopn, mpon, opmn, pomn)
a = {mopn, mpon, pmon pomn)