let p,q,r and s be four statements such that:

if p is true, then q is true;

if q is true,then r is true and

if s is true,then at least one of q and r is false.

then it follows that:

a. if p is true then s is false.

b. if s is falsae both q and r are true.

c. if at least one of q and r is false then s is false.

d. if q is true then s is true

• a. if p is true then s is false
• 12 years agoHelpfull: Yes(2) No(0)