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  4. 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?

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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?

WBJEEWBJEE 2020

Solution:

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