What is negation of the compound proposition? If the examination is difficult, then I shall pass if I study hard.

If p : Examination is difficult q : I shall pass  r : I study hard Given result is p⇒(r⇒q) Now, ~(r⇒q)=r∧~q~(p⇒(r⇒q))≡p∧(r∧~q)The examination is difficult and I study hard but I shall not pass.