logic

Question

Comments

But where’s the question?

Answer 1

A. for all person x der exist a job y or (let another) job z is not same as job y then x shouldn't has job z.

Let y!= z and x dont have any job then also A returns true.

B. Returns true if y!=z and x has both jobs y as well as z.

C. If z=y it will return false.

D. if z=y then ~J(x,z) otherwise no problem.

 

D is correct.

Answer 2

i have less confidence in mathematical logic but i feel

 answer should be option D
 

someone please rectify me if  i am wrong  and please  make me understand my mistake