Once you see such a question get ready with a pen and paper. draw the diagram then these question are very simple.
In the actually exam i dont think such a complex question will not be given, but a simple question would be given.But expect the unexpected.
Remember diagram solves the even a complex question
Why to worry about things in which we dont have control, Why to worry about things in which we have control ! !
If you open the box, you will find Heisenberg strangling Shrodenger's cat. And waving this tiny ad: