These questions are based on the following information :
'P = Q' means 'Q' is the father of P'
'P T Q' means 'P is the sister of Q'.
'P ? Q' means 'Q is the mother of P'.
'P $ Q' means 'P is the brother of Q'. 'P £ Q' means 'Q is the son of P'.
'P `xx` Q' means 'P is the daughter of Q'.
Which of the following is not correct ?

Options

A. L $ M T O means O is the sister of L.
B. `M T O £ P = Q` means Q and O are husband and wife.
C. P = Q ? R means R is the grandmother of P.
D. R `xx` S ? T means R is the granddaughter of T.

Explanation

L $ M `rArr` L is the brother of M.
M T O `rArr` M is the sister of O.
So, L = brother of O.

`because` The gender of .O. is not given
So, .O. is either brother or sister of .L..
So, option (a) is not correct.
Option (b):
`M T 0 rArr` M is the sister of O.
`O£ P rArr` P is the son of O.
`P = Q rArr` Q is the father of P

So, .Q. and .O. are husband and wife respectively.
Option (c): P = Q `rArr` Q is the father of P.
Q ? R `rArr` R is the mother of Q.

So, .R. is the grandmother of .P..
Option(d):
`R xx S rArr` R is the daughter of S.
`S ? T rArr` T is the mother of S.

So, .R. is either maternal granddaughter or paternal granddaughter of T. Therefore, only option (a) is not correct.