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A reasonable explanation for the probability confusion alluded to in
a.) Linda is a bank teller.
b.) Linda is a bank teller and is active in the feminist movement.

is that the language of logic and the language of English are not identical. For example, "Or" in logic means either X or Y or both, whereas "or" in English usually means the exclusive "Or" in logic, either X or Y but not both.

When it comes to "and," the reader, when not misreading the "and" for "or," tends to substitute "who," so instead of X and Y, the reader is really considering X|Y which also leads to the belief that (b) is more likely than (a).

Submitted by Paul Alper