Question 2

Express these system specifications using the propositions and logical connectives (including negations).

p: "The user enters a valid password,"

q: "Access isgranted,"

r: "The user has paid the subscription fee"

a) "The user has paid the subscription fee, but does not enter a valid password."

b)"Access is granted whenever the user has paid the subscription fee and enters a valid password."

c) "Access is denied if the user has not paid the subscription fee."

d) "If the user has not entered a valid password but has paid the subscription fee, then access is granted."