"Write an expression for the probability that in a sequence of r random integers in the range [1,n] no integer occurs more than once"

Is my answer right?

Let the sequence be represented by where

So

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- August 30th 2009, 03:14 AMDaRush19Work out this probability
*"Write an expression for the probability that in a sequence of r random integers in the range [1,n] no integer occurs more than once"*

Is my answer right?

Let the sequence be represented by where

So - August 30th 2009, 04:24 AMPlato
- August 31st 2009, 08:16 AMDaRush19
Now that I've worked it out as I'm stuck on when this is approximately equal to

:S