if p(not e)=11/23, what is p(e) and the odds in favor of p(e)?

Answer 1

p(e) is probability of e happening

p(e) is 12/23

Answer 2

The sum of the probabilities of something happening or not happening are 1.0
p(e) + p(not e) = 1
p(e) = 1 - p(not e)

When p(not e) = 11/23,
p(e) = 1 - (11/23) = 12/23.

The odds in favor of an event are expressed as the ratio of the event happening to not happening. In this case it is 12/23 to 11/23, or 12 to 11.