Practice 1,147 free Engineer & Medical Maths - Permutation Combination questions with answers and step-by-step solutions.
A person has three different bags and four different books. The number of ways, in which he can put these books in the bags so that no bag is empty, is:
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 $10^{\text{th}}$ 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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