Edward A. answered 03/19/18
Tutor
4.9
(17)
Math Tutor, Retired Computer Scientist and Technical Communicator
First, use the fact that negation of an AND is the OR of the negations.
∼∼q ∨ ∼( ∼p ∨ ∼r)
q ∨ ∼ ( ∼p ∨ ∼r)
Next use negation of an OR is the AND of the negations
q ∨ ( ∼∼p ∧∼∼r)
q ∨ ( p ∧ R)