2,626 reputation
2928
bio website
location Duluth
age 33
visits member for 2 years, 1 month
seen Sep 26 at 19:53

I am Patrick.


Sep
30
awarded  Explainer
Sep
26
reviewed Approve suggested edit on 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 suggested edit on property of two numbers such that their exponential and product are the same
Sep
12
reviewed Approve suggested edit on 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.
Sep
12
revised Is this correct method to prove that $a^2 + b^2 + c^2 ≥ ab + bc + ac$, when $a,b,c \geq 0$?
added 16 characters in body; edited title
Aug
23
awarded  Popular Question