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Which statement is logically equivalent to the following conditional statement?

If it is a rectangle, then it does not have three sides.
If it is not a rectangle, then it has three sides.
If it has three sides, then it is not a rectangle.
If it does not have three sides, then it is a rectangle.
If it is not a rectangle, then it does not have three sides.

Respuesta :

The best answer is:
If it is a rectangle, then it does not have three sides.
This statement is also known as the equivalent contra-positive.

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