Read the following information to answer the questions:
A+B means A is father of B.
A-B means A is sister of B.
A `xx`B means A is husband of B
A`div`B means A is wife of B.
Which of the following means P is grandmother of O?

Options

A. `P div R + S xx T - U xx O`
B. `P div R + S + T + O`
C. `P div R + S + B + K xx L - O `
D. `P div R + S - T + O xx U`

Answer

D

Explanation

If P is to be grandmother of Q, P and Q should have a generation gap of 2 between them. Now, out of the given four relationships only one i.e. + (father) has a relationship that has some gap. So , a correct answer must have exactly 2 + sign between P and Q. This eliminates choice 1.
Again if Q was to be a grandchild , the path between P and Q should have continuous blood-relations . But in choice (2), Q and T are not blood related , in choice 3, S and B are not blood-related. This leaves choice 4 only. Let us try its tree:
`{:(P (-) hArr R (+)),(" "|),(" "S (-)- T (+)),(" "|),(" "Q (-)hArr U (+)):}`