If A × B means A is the son of B

If A + B means A is the daughter of B

If A ÷ B means A is the wife of B

If A – B means A is the father of B

What will come in place of the question mark, to establish that Q is mother of N, in the following expression ?

N + O – P ? Q

either (a) or (b)

 Note:

↑ or ↓ ⇒ Upward or downward line shown "generation gap" .

   =    ⇒ Double lines shown "relation b/w Husband & Wife"

   —   ⇒ single line shown "relation in same generation other than Husband & Wife".

   +   ⇒ Plus sign shown " Male".

   -   ⇒ Plus sign shown " Female".

Hence, P is either son or daughter of Q