If' A$ B' means 'A is the father of B', 'A * B' means 'A is the mother of B', 'A@ B' means' A is the wife of B', then which of the following means 'M is the grandmother of N'?

Options

A. M `star`T $ N @ R
B. M`star`T $ R @ N
C. M `star`R $ T @ N
D. M `star` R @T @ N

Answer

A

Explanation

M * T =Mis the mother of T.
T $ N = T is the father of N
So, M mother of T father of N.
So, M is the mother of the father of N.
Therefore, .M. is the grandmother of .N..