Please answer this questions.

a. If L1Ln is a constituent of the disjunctive normal form of F(P1,,Pn), where Li is either Pi or Pi, prove that L1 Ln is a constituent of the conjunctive normal form of F, where Pi=Pi, and Pi=Pi. b. Prove that the number of constituents P1Pn of the disjunctive normal form of F plus the number of constituents P1Pn of the conjunctive normal form of F is 2n. c. Conclude that if F has 5 variables, then either the conjunctive normal form or the disjunctive normal form of F involves at least 16 constituents and hence at least 144 symbols