Sufficient Conditions and Necessary Conditions: Some Basics

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In this video, I walk us through an analysis of the concepts, sufficiency and necessity, in terms of the conditional claim.
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Currently, I am studying for the LSATs. I have several sources that claim that when you switch the two conditions, it mistakes the necessary for sufficient.

So, for example: if I live in LA, then I live in California. Since I live in California then I live in LA.

Here I can how it is mistakes a necessary condition for a sufficient one.

However, I can across an example that seems to contradict the mistakes a necessary for sufficient.

If you to want to live in LA, you must live in California. Therefore, if you want to live in California, you must life in LA.

I do see how when they are switched, both conditions are switched. But does this mean that it mistakes a necessary for sufficient? Does it also depend on the language used?

DavidMrKidcolombia