Question

which set represents (~r n s) u (~t n s) ?

Answer 1

(~r n s) u (~t n s) means ?

Answer 2

i haven't seen that notation before (-t) and (-r)
what does it mean?

Answer 3

does it mean all the elements thats not in t? i.e. the complement of t?

Answer 4

yes

Answer 5

oh ok another way of writing that is t'
(~r n s) = {k,m,n,j,h,i} n {d,k,m,n,f,e,j}

= {k,m,n,j}

you can do the second part in similar way

then do the union of these 2 sets