Define tautology. Prove the proposition is a tautology:
{(p \rightarrow q) \land (q \rightarrow r)} \rightarrow (p \rightarrow r).
Answer:-
Define tautology. Prove the proposition is a tautology:[latex]{(p \rightarrow q) \land (q \rightarrow r)} \rightarrow (p \rightarrow r)[/latex]