Class 11MathematicsPermutation and CombinationDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
EasyIn a library,there are $a$ books of type $A$,$2$ books of type $B$,$3$ books of type $C$,and $1$ book of type $D$. In how many ways can these books be arranged?
- A$\frac{(a + 6)!}{a! (2!)^1 (3!)^1}$
- B$\frac{(a + 6)!}{a! 2! 3!}$
- C$\frac{(a + 6)!}{a!}$
- DNone of these
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