#9 - Local, Must Be True, Minimum

[Dave Killoran]

Complete Question Explanation
(The complete setup for this game can be found here: lsat/viewtopic.php?t=1891)

The correct answer choice is (A)

If both types of jazz are on sale, then the third rule applies, and no types of rap are on sale. As neither piece of information is sufficient to force anything else to occur, the only new type of music that must be on sale is jazz, and the correct answer is one.

[Basia W]

Good evening,

If both types of jazz are on sale, and the New pop must be on sale wouldn't the number of CD's at minimum be two?

thank you,

best,

Basia

[David Boyle]

Good evening,

If both types of jazz are on sale, and the New pop must be on sale wouldn't the number of CD's at minimum be two?

thank you,

best,

Basia

Hello Basia W,

It's actually the used pop that must be on sale, rule 1. If both types of jazz are on sale, new and used, plus the used pop, that would be 3 CD's, but only one new CD, so that the answer for #9 would be A, "one".

Hope this helps,
David

[Basia W]

Hello,

so by "new" CD they are referring to the new jazz.

thank you for your help!

Best,

Basia

[Adam354]

I'm missing something here.

4th rule, If neither type of Jazz is on sale, then New pop is.

Jn and Ju OUT -> Pn IN

Contrapositive: Pn OUT -> Jn OR Ju IN

This means that if Pn is out, then both types of Jazz cannot be on sale like the questions says. This means Pn has to be in to fulfill the question stem.

This then forces S in.

So shouldn't the answer be 3 instead of 1?

[Adam354]

Pn -> Jn or Ju in OR BOTH. That explains the last comment.

[Rachael Wilkenfeld]

Hi Adam,

The way the term "or" is used on the LSAT is inclusive. That is, it means it includes the idea of "or both." When the test makers want the "or" to be an exclusive "or" they will use the phrase "but not both."

It can be hard to interpret the language sometimes on the test, but they are consistent with their language usage. So once you learn something like this, you don't have to wonder if it still holds true.

Hope that helps!