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Convert between probability and odds in various formats: fractional, decimal, and American.
"3 to 1" means you win $3 for every $1 bet (plus your stake back).
Total return on $1 bet. 4.00 means $4 total return ($3 profit + $1 stake).
+300: Win $300 on $100. -400: Bet $400 to win $100.