The number of ways in which 12 books can be put in
three shelves with four on each shelf is
a. `(12 !)/((4!)^3)`
b. `(12 !)/((3!)(4!)^3)`
c. `(12 !)/((3!)^3 4!)`
d. none of these
A. `(12!)/((4!)^(3))`
B. `(12!)/((3!)(4!)^(3))`
C. `(12!)/((3!)^(3)4!)`
D. none of these
