In a 12 storied building, 3 persons enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor?

Question

In a 12 storied building, 3 persons enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor? (A) 36 (B) 120 (C) 240 (D) 720

Tardigrade Admin · Accepted Answer

Total no. of ways = 10 P3=720 (except the floor they enter and second floor)

Q. In a $12$ storied building, $3$ persons enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor?

36

120

240

720

Total no. of ways $=^{10} P_{3} = 720$ (except the floor they enter and second floor)

Q. In a 12 storied building, 3 persons enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor?

36

120

240

720

Total no. of ways =10P3​=720 (except the floor they enter and second floor)

Q. In a $12$ storied building, $3$ persons enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor?

Total no. of ways $=^{10} P_{3} = 720$ (except the floor they enter and second floor)