It's very tempting to concentrate on singles as they constitute 72% of all combinations.
But I see this from the following angle:
The ods for winning a double are 10 X 10 = 1 in 100.
The same ods for a single are 10 X 10 X 10 = 1 in 1000.
Of all combinations possible in Pick 3:
720 are singles
270 are doubles
10 are triples.
The ratio of singles to doubles is roughly 2.7 to 1. Far from 10 to 1.
And on top of this doubles pay more than singles. Which means that
if you ONLY play box singles you will ALWAYS win LESS money than
if you ONLY play box doubles.
Looks straightforward and logical to me. Conclusion: if you want to
make money in Pick 3 - you`ve gotta play doubles. Period. And if you
can`t make money in Pick 3 what`s the point of playing it?