## Thinking Mathematically (6th Edition)

$\frac{1}{29}$
If the odds against event E are a to b, then the probability of the event is given by P(E) =$\frac{b}{a+b}$ The odds against deep-vein thrombosis are 28 to 1. P(E) = $\frac{1}{28+ 1}$ = $\frac{1}{29}$