Answer
49:1
Work Step by Step
The odds against E are found by taking the probability that E will not occur
and dividing by the probability that E will occur.
Odds against E = $\frac{P(not E)}{P(E)}$
We find the odds that you will win a boat if you purchased 20 out of 1000 raffle tickets.
P(E) = $\frac{20}{1000}$ = $\frac{1}{50}$
P(not E)= 1- P(E)
=1 - $\frac{1}{50}$
=$\frac{50 - 1}{50}$
=$\frac{49}{50}$
Odds against E = $\frac{\frac{49}{50}}{\frac{1}{50}}$ = $\frac{49}{1}$
