2,626 reputation
21029
bio website
location Duluth
age 33
visits member for 2 years, 2 months
seen Dec 15 at 22:11

I am Patrick.


Dec
15
awarded  Caucus
Nov
19
awarded  Notable Question
Sep
30
awarded  Explainer
Sep
26
reviewed Approve Prove that this is a metric space?
Sep
25
awarded  Yearling
Sep
20
accepted Number of ways to put $k$ different numbers in $n$ place
Sep
20
reviewed Approve property of two numbers such that their exponential and product are the same
Sep
12
reviewed Approve Combinatorics Domain Names
Sep
2
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.
Sep
2
revised Number of ways to put $k$ different numbers in $n$ place
added 119 characters in body
Sep
2
comment Number of ways to put $k$ different numbers in $n$ place
Yes, each number can appear more than once.
Sep
2
asked Number of ways to put $k$ different numbers in $n$ place
Jul
2
awarded  Curious
Jan
21
awarded  Notable Question
Dec
17
awarded  Popular Question
Sep
30
comment Prove that $\frac{n!}{(n-k)!} = n^{\underline{k}}$
The definition can be found here.
Sep
25
awarded  Yearling
Sep
21
comment $n!\sum_{k=1}^n \frac{a_{k}}{k!}$ is always integer.
$n!/k! = n(n-1)\cdots(n-k+1)$ is always integer.
Sep
18
comment Word and Latex: Probability
Your thought on (a) is not correct.
Sep
12
comment Expressing $A \cup B \cup C$ as a union of mutually exclusive events
If you draw a Venn diagram, it will be easier.