Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

Username is available taken
show password

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't Know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Logic Reasoning 6

Conditional Reasoning- sufficient and necessary

sufficient condition an even or circumstance whose occurrence indicates that a necessary condition must also occur
necessary condition an event or circumstance whose occurrence is required in order for a sufficient condition to occur
if there is a sufficient condition... there has to be a necessary condition
if there is a necessary condition... doesn't mean anything
logical feature #1 1) sufficient doesn't MAKE necessary occur
logical feature #2 either can occur first or can occur at same time
logical feature #3 relationship doesn't have to reflect reality
Original to contra-positive, A -> B not B -> not A
Original to contra-positive, C -> not D D -> not C
contra-positive reversed and negated, so valid
if sufficient indicator
when sufficient indicator
whenever sufficient indicator
every sufficient indicator
all sufficient indicator
any sufficient indicator
people who sufficient indicator
in order to sufficient indicator
then necessary indicator
only necessary indicator
only if necessary indicator
must necessary indicator
required necessary indicator
unless necessary indicator
except necessary indicator
until necessary indicator
without necessary indicator
"unless, expect, until, without" whatever is modified by "unless, expect, until, without" becomes necessary, remaining term is negated and sufficient
"Unless they study, they won't get an A+." sufficient = get A+ necessary = study
"no, none" modifies necessary condition
"No robot can think." Actually means... All robots cannot think. "If robot, then can't think."
"only way" only modifies way
"The only way to achieve success is to work hard." sufficient = achieve success necessary = work hard "To achieve success, the only way is to work hard."
"either/or" at least one of the two, possible both
Multiple contra-positive replaces "and" with "or" and vice versa
"To graduate from college you must be both smart and resourceful." sufficient = graduate necessary = smart AND resourceful contra- sufficient = not smart OR not resourceful contra-necessary = not graduate
Double arrow, "if and only if" each term is both sufficient and necessary for the other
Double NOT arrow two terms cannot occur together
Created by: mrshelley
Popular LSAT sets




Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
restart all cards