# distinct permutations

• Aug 7th 2012, 05:48 AM
mathewnaren
distinct permutations
• Aug 8th 2012, 06:14 AM
JohnDMalcolm
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 $\frac{N!}{r!s!}$.
• Aug 11th 2012, 07:06 AM
mathewnaren
Re: distinct permutations
Pls someone give me the answer for the question
• Aug 11th 2012, 07:37 AM
Plato
Re: distinct permutations
Quote:

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

B