12 In a rotational schedule, how many possible ways can 21 nurses be
arranged at a time?
A 2.430 081 762 902 64 x 1018
B. 2.430 817 662 902 04 x 1018
C 2.432 902 008 176 64 x 1018
C. 2.490 200 817 632 64 x 1018
13.1 a game called "Trip To Jerusalem", in how many ways can 7 people
be seated?
A. 270
B. 720
C. 5004
D. 5040
14. In how many ways can 8 teachers be seated in a circular conference?
A. 5040
B 5400
C. 32 400
D. 40 320
15. In a group of 9 teachers, in how many ways can they sit in a circular
meeting?
A 40 302 B. 40 320
C. 360 882
D.362
880​