October 2005 Logic Games #2

[helplaw2008]

Pretty difficult, any one has an idea how to approach this?

[KaplanLSATInstructor]

If I'm not mistaken, this is the light switch game. Actually, it's not as complicated as it seems. It's a classic game of selection (just decide which switches are on), with one twist: the circuit load. If you understand the circuit load issue, the game isn't so bad.

Based on the opening, the circuit load is simply the number of switches that are on. This is important for the last rule. Basically, the last rule says that if the circuit load is some number X, then switch #X must be on. For example, if there are three switches on, one of those switches must be Switch 3. If four switches are on, then Switch 4 must be among them.

The other two rules are standard formal logic.

To illustrate how the circuit load applies in a question, look at question 8:

Q. 8 says that exactly two switches are on. That means (based on the last rule) one of them must be Switch 2. According to the second rule, if Switch 4 were on, then Switch 2 would have to be off. So, since Switch 2 is on, the contrapositive tells us that Switch 4 must be off... and that's your answer to the question.

Let me know you need further explanation.

- Chris

[EarlCat]

Other than the "load of the circuit" clue, this game works exactly like the birds-in-the-forest game.

[hopeful1985]

Other than the "load of the circuit" clue, this game works exactly like the birds-in-the-forest game.

+1 it's a pretty standard grouping game. even reminds me of one of the 1997 games with the seven friends or something (Umiko, Y, W, Z, T, S, R,) sick how I know that lol.

[EarlCat]

Other than the "load of the circuit" clue, this game works exactly like the birds-in-the-forest game.

+1 it's a pretty standard grouping game. even reminds me of one of the 1997 games with the seven friends or something (Umiko, Y, W, Z, T, S, R,) sick how I know that lol.

Yeah, the photograph game..  same thing again.

[KaplanLSATInstructor]

Other than the "load of the circuit" clue, this game works exactly like the birds-in-the-forest game.

+1 it's a pretty standard grouping game. even reminds me of one of the 1997 games with the seven friends or something (Umiko, Y, W, Z, T, S, R,) sick how I know that lol.

Yeah, the photograph game..  same thing again.

And don't forget the fruit stand game with the figs, kiwi, watermelon, tangerines, etc. One of my all-time favorites.

[hopeful1985]

Other than the "load of the circuit" clue, this game works exactly like the birds-in-the-forest game.

+1 it's a pretty standard grouping game. even reminds me of one of the 1997 games with the seven friends or something (Umiko, Y, W, Z, T, S, R,) sick how I know that lol.

Yeah, the photograph game..  same thing again.

And don't forget the fruit stand game with the figs, kiwi, watermelon, tangerines, etc. One of my all-time favorites.

heck yeah i love that game!