Statements: No system is a desk. All desks are books. Which of the given conclusions follow?
1.Some systems are books
2.Some systems are not books
3.Some books are systems
4.Some books are not systems
AOnly 2 follows
BOnly 4 follows
C1 and 4 follow
DEither 1 or 2, and 4, follow ✓ Correct
Correct answer: (D) Either 1 or 2, and 4, follow
Explanation
Conclusion 4 follows, and of 1 and 2 exactly one must, so either 1 or 2 follows.
'All desks are books' gives some books are desks, and 'no system is a desk' excludes those from systems.
So some books are not systems, which is 4.
For systems and books beyond desks the premises fix nothing definite.
'Some systems are books' and 'some systems are not books' make a complementary pair, so one must be admitted.
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