## Logical Opposities

Prepare for the LSAT or discuss it with others in this forum.
msw099

Posts: 22
Joined: Wed Nov 11, 2009 2:19 am

### Logical Opposities

Hi All:

What is the logical opposite of "At Least Some" and "At Least One?" I figured that these were the same but a book is telling me otherwise.

I thought that the logical opposite for both was none. Is this correct?

This will help me on negating some necessary assumptions.

Thank you!

cinefile 17

Posts: 257
Joined: Wed Apr 14, 2010 10:32 pm

### Re: Logical Opposities

I would agree that these two phrases are logically the same and that the logical opposite of both would be none.

nonamebreakdown

Posts: 56
Joined: Tue Mar 09, 2010 12:34 am

### Re: Logical Opposities

"Some"/"At least some" = 1 or more

negation is none.

example: negation of "Some people like the color blue" is "No one likes the color blue."

cubswin

Posts: 617
Joined: Mon May 25, 2009 4:40 pm

### Re: Logical Opposities

msw099 wrote:Hi All:

What is the logical opposite of "At Least Some" and "At Least One?" I figured that these were the same but a book is telling me otherwise.

I thought that the logical opposite for both was none. Is this correct?

This will help me on negating some necessary assumptions.

Thank you!

Yes, you are correct. The opposite of "At least one" is none, and "some" is an indefinite quantity, so on the LSAT assume that it means "at least one."

msw099

Posts: 22
Joined: Wed Nov 11, 2009 2:19 am

### Re: Logical Opposities

That's what I thought, thanks.

msw099

Posts: 22
Joined: Wed Nov 11, 2009 2:19 am

### Re: Logical Opposities

What about the logical opposite to "usually and Most?" Is it "Not usually and not most or less than half?"

Thanks again.

iamcutdacheck

Posts: 92
Joined: Sat Jun 05, 2010 5:23 am

### Re: Logical Opposities

msw099 wrote:What about the logical opposite to "usually and Most?" Is it "Not usually and not most or less than half?"

Thanks again.

unusually or least

youpiiz

Posts: 233
Joined: Thu Feb 12, 2009 11:01 am

### Re: Logical Opposities

freedom fries and petain poutines

cubswin

Posts: 617
Joined: Mon May 25, 2009 4:40 pm

### Re: Logical Opposities

msw099 wrote:What about the logical opposite to "usually and Most?" Is it "Not usually and not most or less than half?"

Thanks again.

Well, most means more than half, so the opposite would be less than half. I don't think "usually" is used a quantity statement all that often. I don't know whether to assume it means "Most of the time" or if it's not specific enough and should just be taken to mean "some."

bp colin

Posts: 166
Joined: Thu Mar 11, 2010 2:08 pm

### Re: Logical Opposities

cubswin wrote:Well, most means more than half, so the opposite would be less than half.

Actually, the opposite would be "not more than half." Which doesn't actually have to mean less than half; it means half or less. The LSAT's required you to make that inference a few times.

cubswin

Posts: 617
Joined: Mon May 25, 2009 4:40 pm

### Re: Logical Opposities

bp colin wrote:
cubswin wrote:Well, most means more than half, so the opposite would be less than half.

Actually, the opposite would be "not more than half." Which doesn't actually have to mean less than half; it means half or less. The LSAT's required you to make that inference a few times.

Damn, you are right.