Question

Each question contains six statements followed by four sets of combinations of three. Choose the set in which the combinations are logically related.
A. Some abra are dabra.
B. All abra are cabra.
C. All dabra are abra.
D. All dabra are not abra.
E. Some cabra are abra.
F. Some cabra are dabra.

• A. AEF
• B. BCF
• C. ABD
• D. BCE

Answer 1

The correct option is B BCF

A, E and F are I-types of propositions, therefore, no conclusion can be drawn as $I+I\Rightarrow$ No conclusion
These cannot be logically related.
Some dabra are abra. [I-type]
All abra are cabra. [A-type]
$I+A\Rightarrow I$
Conclusion : Some dabra are cabra
The converse of the conclusion : Some cabra are dabra [statement F].
But A, B and F combination is not given.
Some cabra are abra. [I-type]
All abra are dabra. [A-type]
$I_A\Rightarrow I$
Conclusion: Some cabra are dabra.
The converse of the conclusion: Some dabra are cabra.
Converse: Some cabra are dabra [Statement F].
Clearly, B, C and F are logically related.