The conjunction fallacy occurs when people assume that specific conditions are more probable than a single general one, violating the laws of probability. This is illustrated by the famous Linda problem, where individuals judge that a person described in detail as a bank teller and a feminist is more likely than simply being a bank teller, even though the latter has a higher probability of occurring.
In the Linda problem, most participants incorrectly judged that Linda, a 31-year-old single woman who studied philosophy and was active in social issues, is more likely to be a bank teller who is active in the feminist movement than just a bank teller, despite the fact that this conjunction is statistically less likely.
To overcome the conjunction fallacy, it's vital to rely on statistical reasoning rather than intuitive judgments. Always question whether a conjunction of events can logically be more probable than the individual events alone.