If the odds against an event 3:5, the probability of that event is June 7, 2021 – by admin Question: If the odds against an event 3:5, the probability of that event is A. 3/8 B. 5/8 C. 2/3 D. 1/3 Answer» b. 5/8 Note: The above multiple-choice question is for all general and Competitive Exams in India.