Question:medium

A lift of a 10 floor building contains 9 persons and group of 4 and 5 leave the lift on different floor and there is no stoppage of lift at 1st and 2nd floor, then find number of ways this can be done.

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Always identify the constraints on the "available options" (floors) first. Since the groups exit on "different" floors, we use permutations (\(^n P_r\)) or selection followed by arrangement.

Updated On: Apr 7, 2026

7056
7656
7066
7057

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The Correct Option is A

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A lift of a 10 floor building contains 9 persons and group of 4 and 5 leave the lift on different floor and there is no stoppage of lift at 1st and 2nd floor, then find number of ways this can be done.

Show Hint

The Correct Option is A

Solution and Explanation

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