Statements P, Q, R, and S are given. Write down without proof the negations of the following.  a) (P => Q) => R b) (P => Q) or (R and S)

a)find a proposition using only p, q, and ~ (negation) and V (or)  b) find a propostion with three variables p, q, and r that is false when at least one of the prepositons is true and is true otherwise

ints) Use DeMorgan's laws to write the negations of the following statements. a. Sam is a math major and Jane is a CS major. p. x > 2 or x < 0

part C D