CBSE · Class 6-12

Back to Propositions and their Converses

Class 9 · Ganita Manjari · Unit 9: Propositions and their Converses

Contrapositive and Proof by Contradiction

Lesson 3 of 3

p \Rightarrow q

is equivalent to

\neg q \Rightarrow \neg p

. Many number-theory proofs use the contrapositive because it's easier to argue about.

Conditionals and their Converses

Try the practice skills

All lessons in this unit