LSAT arguments are different in structure than arguments we are otherwise used to in everyday life. Very different. Your success on the LSAT depends on your ability to recognize the structure of LSAT arguments, find flaws where necessary, and differentiate between valid LSAT arguments and invalid ones.
All valid LSAT arguments contain at least two premises and one conclusion
A conclusion is the statement that an argument is trying to convince us of. A premise is a statement intended to support the conclusion. Valid LSAT arguments are, therefore, almost like mathematical equations because the premises, when added together, must equal the conclusion.
Consider the following example:
Premise: Rover is a dog
Premise: All dogs play fetch
Conclusion: Rover plays fetch
When we add the premises together, i.e., that Rover is a dog and all dogs play fetch, we are forced to conclude that Rover plays fetch.
REMEMBER: Take LSAT arguments at face value . . . .
On the LSAT, you should never try to attack the “real world” factual validity of the premises themselves. So, in the example above, you would never try to challenge the premise that all dogs play fetch. Although we know in the real world that not every dog plays fetch, in the LSAT world, you take the premises at face value.
Valid and Invalid LSAT Arguments
A valid LSAT argument is not an argument that is merely persuasive or that you agree with. Instead, an LSAT argument is an argument where the premises logically add up to the conclusion. In philosophy, this is called a deductive argument. If it does not add up (like in a mathematical equation), then it is an invalid argument.
Consider this example:
Kobe is the highest scorer in the NBA
Kobe is on the all-defensive team
Kobe is the best player in the NBA
While this argument may be persuasive, on the LSAT it would not be considered valid because the premises do not have to add up to the conclusion. In other words, in the example above, the conclusion does not have to be true.
The distinction between real world arguments and LSAT arguments is critical. You must learn the difference between the two to do well on the LSAT. The best way to do this is by reviewing actual LSAT problems and LSAT explanations so that you can observe this principle in practice.
Hopefully this brief lesson on LSAT arguments and LSAT logic can clear up some confusion about the LSAT.
JUL



