@breezyprabahar944 replying for reference

@Omarrah I wondered the same thing at first, but it actually is a valid contrapositive. The earlier examples can make it seem like one term must be negated while the other remains unchanged. However, that's not how contraposition works.

Think of it this way: a negated term is a minus sign (−), and a non-negated term is a plus sign (+). Similar to algebra, when a term moves to the other side of an equation, its sign changes. With contraposition, when a statement switches sides of the arrow (→), its negation status flips.

So, in Questions 1–2, one term is negated (−) and the other is not (+). When you take the contrapositive, they switch sides and both signs flip, resulting in + and −.

In Questions 3–4, both terms are non-negated (+ and +). When you take the contrapositive, they switch sides and both become negated (− and −).

The key rule is that when forming a contrapositive, you reverse the direction of the statement and negate both terms. Whether a term ends up negated or not depends on whether it was originally negated before the switch.