"Most are not"

[lizk89]

Formal logic question, p. 308 of powerscore.

All = 100
Most = 51 to 100
Some are not = 0 to 99
Most are not = 0 to 49
Some = 1 to 100
None = 0

I don't understand why most are not = 0 to 49. Is "most are not" the equivalent as saying "not most?" And, if so, why isn't it 0 to 50?

[Adam Tyson]

Think of it this way, Liz - "most" means "more than half". "Not most" means "not more than half", so 50 (half) is included in "not most" (because half is not more than half). "Most are not", on the other hand, means "more than half are not", so 50 (half) can't be included in that group. If half are, then you can only have 50 that are not, and 50 is not more than half.

Did that help?

Adam M. Tyson
PowerScore LSAT Instructor

[lizk89]

Yes.
Merci beaucoup!