Please figure this out

[RedeemerKing]

I figured there would be a lot of math guys in here who might be able to figure this one out.

This is a math question related to sports, particularly money lines. I can usually narrow it down to 4 picks on a given day. My EV would be -10%, assuming dime lines, of what I risked if I was to do 4 straight bets, right? What would be my expected value if I did a round robin with 3 team combinations of the same 4 teams and risked the same amount. I'm pretty sure it would be lower, but cant mathematically figure it out. Any help would be appreciated

PS If u dont know..... A round robin would give me every possible 3 team combination in a parlay of the original 4 teams for a total of 4 3team parlays