Permutations & Combinations · Distribution into groups and floors
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 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:
- (1)2184
- (2)3064
- (3)7056
- (4)11340
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