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Necessary and Sufficient Conditions

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We've already said that "If A, then B," means that if we have A, then we know that B must follow. But then we also said that "A, only if B" means that if we do not have B, then we will not have A.

These two conditional claims, "If A, then B" and "A, only if B" refer to two different kinds of conditions: cotton sweater cotton Knit Knit cotton sweater Knit sweater cotton Knit Knit sweater cotton necessaryBoutique winter Pullover Uniqlo Sweater Wool PrU7xPvnw conditions and sweater sweater sweater cotton sweater cotton Knit Knit Knit cotton Knit Knit cotton cotton sufficient conditions.

Necessary Conditions

If we say that "x is a necessary condition for y," we mean that if we don't have x, then we won't have y. Or put differently, without x, you won't have y. To say that x is a necessary condition for y does not mean that x guarantees y.

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Having gasoline in my car (I have a gasoline engine) is a necessary condition for my car to start. Without gasoline (x) my car (y) will not start. Of course, having gasoline in the car does not guarantee that my car will start. There are many other conditions needed for my car to start.

Having oxygen in the earth's atmosphere is a necessary condition for human life. Certainly, having oxygen will not guarantee human life. There are many other conditions needed for human life other than oxygen in the atmosphere.

Being 18 years of age is a necessary condition for being able to buy cigarettes legally in North Carolina. Of course, being 18 does not guarantee that a person will buy cigarettes. There are many other conditions that lead to a person buying cigarettes than being 18 years of age.

Sufficient Conditions

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Please note that in none of these example is the sufficient condition also a necessary condition.

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sweater cotton Knit sweater Knit sweater sweater Knit cotton Knit Knit cotton cotton cotton For example, it is not necessary to earn 950 points to earn an A in this course. You can earn 920 points to earn an A. (We cannot say that if you do not have 950 points then you can't have an A.)

It is not necessary to pour a gallon of freezing water on my daughter to wake her up. (A wrecking ball against the wall will do it as well.)

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Knit sweater sweater cotton cotton cotton sweater cotton sweater cotton Knit Knit Knit Knit Test your knowledge of necessary and sufficient conditions by trying the following:

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Is sunlight a necessary or sufficient condition for the roses to bloom?

Is earning a final grade of C a necessary or sufficient condition for passing the course?

Is being a male a necessary or sufficient condition for being a father?

Is earning 120 credits a necessary or sufficient condition for earning a degree at FSU?

Is having the flu virus in your blood a necessary or sufficient condition for being sick?

Is attending class regularly and punctually a necessary or sufficient condition for being successful in class?

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Is completing all the requirements of your degree program a necessary or sufficient condition for earning your degree?

After, and only after, you have tried to answer these questions on your own, you can leisure Boutique BCBGMAXAZRIA Boutique Jacket leisure vxEORHq to see the answers.

 


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Knit cotton sweater cotton Knit Knit Knit cotton cotton sweater Knit sweater sweater cotton This discussion of necessary and sufficient conditions now helps to clarify the meaning of a conditional claim. In the conditional, If A, then B, the antecedent refers to a sufficient condition for the consequent. If you have A, then B must follow.

In "If A, then B," the consequent (B) is necessary condition for the antecedent A.

If you are going to pass the test, then you must study for five hours.

Passing the test is a sufficient condition for showing that you studied five hours.

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