Q10

[MeganE678]

Can I get an explanation why D was wrong? I quickly narrowed it down to B and D but guessed from there.

[Laura Damone]

Sure thing!

But first, how did you diagram the S and V rule? That's what ultimately eliminates D. The rule says if S is out, V is in. The contrapositive is that if V is out, S is in.

M being in forces T in (rule 2), which forces F and V out (rule 5). V out forces S in. Once they're all placed, ask "who's left?" Only L and R. What do we know about them? We know they can't both be out, so at least one of them must be in. The could also both be in. The only thing prohibited is both of them being out.

Hope this helps!