A * B means A and B are of the same age;
A - B means B is younger than A;
A + B means A is younger than B;
For an expression Farha - Farida - Arif, which of the following cannot be correct under any circumstances ?
Farha - Farida - Arif means Farida is younger than Farha and Arif is younger than Farida.
This means that Arif is younger tha Farha. So, Arif cannot be the father of Farha.