Class 11MathematicsPermutation and CombinationDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
DifficultThere are $m$ books in black cover and $n$ books in blue cover,and all books are different. The number of ways these $(m+n)$ books can be arranged on a shelf so that all the books in black cover are put side by side is
- A$m! n!$
- B$m! (n+1)!$
- C$(n+1)!$
- D$(m+n)!$
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$_{n-1}P_r + r \cdot (_{n-1}P_{r-1}) = \dots$
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