implication is false when lhs is true and rhs is false
so rhs p->r is false if p is true and r is false (we assume RHS is false)
coming to lhs it is conjunction of two terms
-q is true that means q is false
p->(q or r) p is true q and r are false so T->F is false
so lhs is false and false that gives false
F->F is true
so it is tautology(bcoz if rhs is false lhs is also false )