easy · GMAT Verbal

Which of the following is its logically equivalent contrapositive?

1. If the ground is wet, then it rained.
2. If the ground is not wet, then it did not rain.
3. If it does not rain, then the ground will not be wet.
4. The ground is wet and it did not rain.
5. If it rains, then the ground might not be wet.

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