Betting maths and calculators
Can two bookmakers offer opposite sides with a combined implied probability under 100%?
Direct answer
Yes, temporarily or through differing markets, but fees, betting limits and settlement-rule mismatch can eliminate the apparent margin.
How to use this answer
This answer is based on the mathematical principle or published rule identified in the source below. If the question involves a live betting market, confirm its settlement definition before applying it to a specific bet.
Use the precise stake, decimal odds, market terms and outcome probabilities when calculating the result. Expected value measures an average over hypothetical repetitions, not a guaranteed profit.