question_answer

\[P\times Q\]means P is the sister of Q;\[P+Q\] means P is the father of Q; \[P-Q\]means P is the mother of Q. Which of the following means S is the aunt of T?

A)  \[\text{T}\,\,\text{ }\!\!\times\!\!\text{ }\,\,\text{M}\,\,\text{+}\,\,\text{S}\]

B)  \[\text{S}\,\,\text{+}\,\,\text{T}\,\,\text{ }\!\!\times\!\!\text{ }\,\,\text{M}\]

C)  \[\text{S}\,\,\text{ }\!\!\times\!\!\text{ }\,\,\text{M}\,\,\text{+}\,\text{T}\]  

D)  \[\text{S}\,\,\text{ }\!\!\times\!\!\text{ }\,\,\text{M}\,\,\text{+}\,\,\text{R}\,\,-\text{T}\]

Correct Answer: C

Solution :

[a] \[\Rightarrow \]M is S's father and T-is M's sister, i.e. T is aunt of S. [b]   \[\Rightarrow \]This relation shows S is T's father. [c]    \[\Rightarrow \]S is M's sister and M is T?s father, i.e. S is aunt of T.