Supply the missing premise that makes the conclusion follow logically: P: D–most–BP: ?C:B–some–C

Mehran August 18, 2016

@petitfantome thanks for your message. Let's review.

The rules to make a valid deduction with a Quantifier statement are as follows:

(1) Need an Sufficient & Necessary statement

(2) Sufficient must be the variable in common (i.e. arrow must point away from Quantifier statement)

Here, we are given the following:

P: D-most-B

P: ?

C: B-some-C

So clearly are missing premise will include C.

We can reverse the first premise to B-some-D (remember "most" becomes "some" when you reverse).

Now, to conclude B-some-C, we need to connect D with C.

So the missing premise here would be: D ==> C

B-some-D ==> C

To conclude:

B-some-C

Hope this helps! For a more in-depth discussion of these concepts, please watch our video lesson on Quantifiers.

sushishivani May 3, 2017

Helped a lot....thanx

crissycakeszx June 30, 2017

@petitfantome I am still confused by your explanation can you break it down easier what you also mean by quantity etc. work through the whole problem no need to solve but just so we understand the question, answers and rules. Thank you
Good luck everyone!

queenvoldy November 25, 2017

What's the - most - or - some - mean??

Mehran November 27, 2017

Hi @queenvoldy - as discussed throughout our course, there are "all/none" statements, "some" statements, and "most" statements. To do well on the LSAT, you need to be able to understand the logical differences between these statements, as well as how they might interact with each other.

So the diagram "B-some-C" is shorthand for the statement "Some Bs are Cs" or "Some Cs are Bs" etc.

Hope this helps. Be sure to carefully review the lectures and other materials on this subject, as it is central to LSAT success. Best of luck!