In a 16 horse race, what is the probability of choosing the winning trifecta? (Disregard odds on horses)

1 answer

permutations of 16 taken 3 at a time
(order matters so permutations)
16!/[(16-3)!]

16!/[ 13! ]

16*15*14

3360 possible groups of 3 out of those 16
1/3360 = .000297 forget it unless you know a lot about the particular horses :) !