1.In how many ways can 12 persons seat themselves at 3 different round tables, 4 at each:

(a) (12!) / (4!)^3

(b) (12!)(3!^3) / (4!^3)

(c) 12!

(d) none of the above

2. In how many ways can 12 persons be divided into 3 groups of 4 each:

(a) (12!) / (4!)^3

(b) (12!)(3!^3) / (4!^3)

(c) 12!

(d) none of the above