# Math Help - distinct permutations

2. ## Re: distinct permutations

The number of permutations of N objects is $N!$. But say r of the objects are indistinguishable, then the number of distinct permutations become $\frac{N!}{r!}$. Suppose that there are r indistinguishable objects of one kind and s of another. Then the number of distinct permutations is $\frac{N!}{r!s!}$.

3. ## Re: distinct permutations

Pls someone give me the answer for the question

4. ## Re: distinct permutations

Originally Posted by mathewnaren
Pls someone give me the answer for the question
B