In a school, there were five teachers.
A and B were teaching Hindi and English.
C and D were teaching English and Geography.
D and A were teaching Mathematics and Hindi
E and B were teaching History and French.

D, B and A were teaching which of the following subjects ?

A. English only
B. Hindi and English
C. Hindi only
D. English and Geography
E. Mathematics and Hindi
Answer: C . Hindi only


Above information can be analysed as below:


English Hindi Mathmatics Geography History French
A X X X      
B X X   X X X
C X     X    
D   X X      
E         X X

Hence, D, B and A were teaching Hindi.