RBI Grade B Officers 21 Nov 2015 Paper

5) Some flutes are guitars.
No guitar is a piano.
I + A ⇒ O–type of Conclusion“Some flutes are not pianoes.”No guitar is a piano.
Some pianos are drums.
E + I ⇒O1 – type of Conclusion“Some drums are not guitars.”
Some pianos are drums.
All drums are violins.
I + A⇒ I–type of Conclusion“Some pianos are violins.”
Venn diagrams of all the premises:

Venn diagrams of “Some flutesare not pianos” :

Venn diagrams of “Some pianosare violins”

After combining Venn diagramsII and V, we get :

Therefore, option (5) may be true.