probability
posted by Sharon .
A batch of 350 raffle tickets contains 4 winning tickets. You buy 4 tickets. What is the probability you have no winning tickets?
b.) all winning tickets?
c.) at least 1 winning ticket?
d.) At least 1 nonwinning ticket?

No winning? 346/350*345/349*344*348*343*347
There are four ways to get at least one winning ticket:
WLLL
WWLL
WWWL
WWWW
Pr(at least one winning ticket)=sum prob of all those.