In how many different ways can 4 physics, 2 math and 3 chemistry books be arranged in a row so that all books of the same branch are together?
Choose the correct option:
A) 1242
B) 1728
C) 1484
D) 1734
E) 1726
Soln:   = 3! * 4! * 2! * 3!   = 1728   Ans is 1728
<result>B</result>
In how many different ways can 4 physics, 2 math and 3 chemistry books be arranged in a row so that all books of the same branch are together?