“If” is easier than “or” in the GRE

In logic, a conditional, such as: “If the trend continues then a decline will occur” is equivalent to a disjunction: “Either the trend stops, i.e., doesn’t continue, or a decline will occur”. Both assertions are compatible with the following three possibilities, where “” denotes negation: https://www.niso.org/standards/z39-96/ns/oasis-exchange/table">

Trend

Decline

⌐ Trend

Decline

⌐ Trend

⌐ Decline