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Persons leaving a lift at different floors

This type of question, asked 2 times: 28 Jan 2026 S2, 6 Apr 2026 S2. All 2 questions below, oldest first.

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  1. Question 1

    28 Jan 2026 S2

    72
    Three persons enter in a lift at the ground floor. The lift will go upto 10th 10^{\text{th~}} floor. The number of ways, in which the three persons can exit the lift at three different floors, if the lift does not stop at first, second and third floors, is equal to ____\_\_\_\_ .

  2. Question 2

    6 Apr 2026 S2

    57
    A building has ground floor and 10 more floors. Nine persons enter in a lift at the ground floor. The lift goes up to the 10th 10^{\text{th~}} floor. The number of ways, in which any 4 persons exit at a floor and the remaining 5 persons exit at a different floor, if the lift does not stop at the first and the second floors, is equal to :

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