If the Cardiology HOD always has a woman to his right, in how many different arrangements can the Nephrology HOD be a woman?
2
3
4
5
From the above three figures, we can conclude that 6 arrangements are possible.
(I) The Nephrology HOD and the CardiologyHOD sit next to each other. (II) The Histology HOD has to be a woman. (III) The Urology HOD has to be a man.
In how many ways can 7 different books be arranged in a shelf? In how many ways can we arrange three particulars books so that they are always together?