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samiralehmeidi on October 14, 2019

Compund Statements (And/Or)

For Example 3, why do we negate both A, B, and C? And not just C?

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Skylar on November 7, 2019

@nimakian Happy to help!

In order to find the contrapositive, we must reverse and negate everything. If we only negated C and left the other side of the equation the same, our contrapositive would be incorrect. This rule is key to understanding Sufficient and Necessary statements.

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