Q20

[ShehryarB30]

Could you pls explain this

[ohthatpatrick]

G R W

The one rule we have for column M is that if you're there, you're also in S.

So as we read these options, we need to think to ourselves, "These people are automatically sent to column S."

(A) could we send R to column S?
Possibly. There's a rule that says if R is in S, then W can't be in S.
But this seems fine, as long as we don't put W in S.

(B) could we send W to S?
Sure, but this triggers the contrapositive of the "If Rs, then ~Ws". If W is in S, then R can't be.

(C) It seems like G and R in S is fine, as long as we don't put W in there.

(D) If G and W went to S, we couldn't put R there.

(E) HERE we go! If we put R and W in M, then we have to put them in S, and they can't co-exist in S because of their rule.