Question 932712
(1) find the odds for an event E, when Pr(E) =1/4  Odds for: 1:3   {{{4-1 = 3}}}
 (2) find the odds against an event E, 
when Pr(E)=5/6 P(notE) = 1/6,  Odds against: 1:5  {{{6-1 = 5}}}
 (3) find the probability of an event,
 when the odds for the event are 6:4  P = 6/10   {{{10-6 = 4}}}