Sufficient and Necessary

[arielmashe]

Are all the answers in Assumption Questions sufficient AND necessary?

[ohthatpatrick]

Nope, sometimes they are, but rarely.

The correct answer to a Necessary Assumption question is just necessary, not necessarily sufficient.
And the correct answer to a Sufficient Assumption question is sufficient, but may or may not be necessary.

There's no point in taking LSAT or studying LSAT where you ever really need to worry about whether it's both.

You're either assessing whether something is Nec or Suff, depending on which question type you're doing. You're never assessing whether something is both.

NEC ASSUMP = if this idea were false, it would badly weaken the argument
SUFF ASSUMP = if this idea were true, combined with our evidence, it would allow to fully derive the conclusion