Question

A+b means a is brother of b a-b means a is father of b a*b means a is mother of

b. then what is a*b-c?

Answer 1

b-c→bis Father of c.
a*b=a is mother of b

So a*b-c= a is the Grandmother of c. or c is the Grandchild of a.

Hope it helps...
Regards,
Leukonov.