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reviewed Approve How nuclear norm is convex whereas weighted nuclaer norm is not?
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reviewed Approve $G^k$ is $k$-connected
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comment Finding variance of the sample mean of a random sample of size n without replacement from finite population of size N.
This is the variance of the mean of a simple random sample in survey sampling. You could find the proof on an introductory book on sampling. For example, home.iitk.ac.in/~shalab/chapter2-simple-random-sampling.pdf
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reviewed Approve Prove that this is a metric space?
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accepted Number of ways to put $k$ different numbers in $n$ place
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reviewed Approve property of two numbers such that their exponential and product are the same
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reviewed Approve Combinatorics Domain Names
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comment Number of ways to put $k$ different numbers in $n$ place
Sorry that my expression was not very clear before. Each place must have one number. Please see the edited post.
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revised Number of ways to put $k$ different numbers in $n$ place
added 119 characters in body
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comment Number of ways to put $k$ different numbers in $n$ place
Yes, each number can appear more than once.
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asked Number of ways to put $k$ different numbers in $n$ place
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awarded  Curious