3. (a) Let e be a truth assignment such that e(P) = T, e(Q) = F, and e(R) = F. Find e((-R - (-P + -Q))). (b) Does there exist a truth assignment e

this is our practice question, i am confused about the question b), i need help thx

3. (a) Let e be a truth assignment such that e(P) = T, e(Q) = F, ande(R) = F. Find e((-R - (-P + -Q))).(b) Does there exist a truth assignment e such that e((-P - P)) =T? Justify your answer.