A 2 odds accumulator is a multiple bet whose combined decimal odds land near 2.00 — usually two legs around 1.41 each, or three legs around 1.26 each. Its combined win probability, fairly priced, is about 50%. The reason 2 odds is the most searched accumulator target in football betting is that it doubles the stake while feeling achievable; the reason it loses money for most bettors is that each leg carries its own bookmaker margin, and margins multiply exponentially as legs are added — 1.05 to the power n for an n-leg ticket at 5% margin per leg.
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