The number of different ways in which 8 persons can stand in a row so that between two particular persons A and B there are always two persons, is
A. 60 × 5!
B. 15 × 4! × 5!
C. 4! × 5!
D. none of these.
Answer:A
The number of different ways in which 8 persons can stand in a row so that between two particular persons A and B there are always two persons, is
A. 60 × 5! B. 15 × 4! × 5! C. 4! × 5! D. none of these.