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Multiple Choice Questions

Conclusions I No star is an astronaut II All astronauts are planets ........

Logical Reasoning (RBI) Syllogism

In these questions, two/three statement followed by two conclusions numbered I and II have been given. You have to take the given statements to be true even if they seem to be at variance from commonly known facts and then decide which of the given conclusions logically follows the given statements? Given answer :
A. If only conclusion I is true
B. If both conclusions I and II are true
C. If either conclusion I or II is true
D. If only conclusion II is true
E. If neither conclusion I nor II true Statements :
Some planets are stars. All stars are comets. No comet is an astronaut.

Conclusions :

I. No star is an astronaut

II. All astronauts are planets

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Explanation:

The least possible diagram for the given statements are below:

Conclusions :
I. No star is an astronaut → It is true. Hence, conclusion I follows.
II. All astronauts are planets → It is possible but not definite. Hence, conclusion II does not follows. Hence, only conclusion I follows.

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