If Ramesh’s mother’s brother is Alok’s father’s brother, then Ramesh’s mother is Alok’s ___

I. ‘A*B’ means ‘A is the sister of B’.

II.  ‘AOB’ means ‘B is the mother of A’.

III.  ‘ A + B’ means ‘ A is the father of  B’

IV. ‘A = B’ means ‘B is the father of A’..

Which of the following means ‘M is the maternal uncle of N’?

In J – F + R × B, how is R related to J ?