All planets orbit a star. Mars is a planet. Which conclusion must be true?
Answer and explanation
Correct answer: C. Mars orbits a star
- Step 1: The first statement gives a property of every one of the planets. Step 2. Mars is a planet, so it has that property. Answer: Mars orbits a star. Why not the others: Everything with this property is among the planets is what you get if you reverse the statement. Mars is not a planet is what you get if you deny the second statement. No planets orbit a star is what you get if you deny the first statement.
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