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Great Advice from Nikki, I thought everyone should know.

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Remember - when negating conditional statements, you need to show that the sufficient condition can occur even in the absence of the necessary condition.

By, Mr. Nicolay Siclunov from ... statements, titled: "Negating Compound and Conditional Statements"
Adam Tyson
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Great advice, lathlee! Another way to look at it is that your goal is to show that the necessary condition is NOT actually necessary. Not that it does not happen, but that it doesn't NEED to happen. That's the way to do it when using the Assumption Negation Technique on a conditional claim!
Adam M. Tyson
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