Unit-I: Sets and Functions
Unit-II: Algebra
Unit-III: Coordinate Geometry
Unit-IV: Calculus
Unit-V: Mathematical Reasoning
Unit-VI: Statistics and Probability


The conjunction of conditional & its converse is called bi conditional. i.e \left( {p \to q} \right) \cap \left( {q \to p} \right) = p \leftrightarrow q.

  • p if and only if q
  • p iff q
  • q if and only if p
  • p is necessary & sufficient for q.
  • q is necessary & sufficient for p.


\Delta ABC is equilateral iff its all sides are equal”


p \leftrightarrow q is true when both p, q are true or false, otherwise it is false.

p \leftrightarrow q is true when and only when p \to q and q \to p are both true.

Truth table

Rendered by QuickLaTeX.com

Scroll to Top