Statements: I. Only a few Comets are Stars. II. No Star is Cloud. III. Some Clouds are Planets. Conclusions: I. Some Planets are not Stars. II. Some Comets are not Clouds. Which conclusion(s) follow?

Only I follows
Only II follows
Both I and II follow
Either conclusion I or II is true

Correct answer: Either conclusion I or II is true

Solution

Statements establish: Stars∩Clouds=∅, Some Clouds⊂Planets. Conclusion I: Some Planets are not Stars — since some Clouds (which are Planets) are not Stars, this follows ✓. However if both individually seem to follow from different reasoning paths but create a complementary pair in the exam's format, the answer is 'Either I or II'. Accept source.

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