medium · GMAT Verbal

Which of the following is the logically equivalent contrapositive of this statement?

1. If a polygon does not have four equal sides, then it is not a square.
2. Every polygon with four equal sides is a square.
3. If a polygon has four equal sides, then it is a square.
4. A polygon is a square if and only if it has four equal sides.
5. If a polygon is not a square, then it does not have four equal sides.

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