Answer
$P(at~least~one~has~driven~while~under~the~influence~of~alcohol)=0.642089$
Work Step by Step
The event "at least one has driven while under the influence of alcohol" is the complement of "none of the 3 has driven while under the influence of alcohol". So, we use the Complement Rule (see page 275):
$P(at~least~one~has~driven~while~under~the~influence~of~alcohol)=1-P(none~of~the~3~has~driven~while~under~the~influence~of~alcohol)=1-0.357911=0.642089$
