Skip to main content
Mathematics
Donald's user avatar
Donald's user avatar
Donald's user avatar
Donald
  • Member for 10 years, 6 months
  • Last seen more than a month ago
Profile Activity
Stats
851
reputation
104k
reached
1
answer
53
questions
Communities
View all
Badges
View all badges
2
gold badges
13
silver badges
29
bronze badges
Top tags
View all tags
0
Score
9
Posts
17
Posts %
0
Score
7
Posts
13
Posts %
0
Score
6
Posts
11
Posts %
0
Score
6
Posts
11
Posts %
0
Score
6
Posts
11
Posts %
0
Score
5
Posts
9
Posts %
Top posts
View all questions and answers
question
7
Combinations: How many handshakes?
Feb 16, 2015
question
5
If $X$ and $Y$ are i.i.d. random variables, is $P(X < Y) = P(Y < X)$?
Aug 23, 2019
question
5
In how many ways can R red, B blue, and G green balls be arranged so that no two balls of the same colour are consecutive?
Mar 28, 2018
question
4
Why can't we simply substitute the input variable into the output of a function?
Jan 27, 2018
question
4
Let $A$ and $B$ be square matrices of order $n$. Suppose that $\mathrm{rank}(A)=\mathrm{rank}(B)$ and $A^2B=A$.
Mar 11, 2017
question
4
Pigeonhole: Committee of senators who hate one another
Nov 12, 2016
question
3
Taylor Series of $ \frac{1}{1-x^2} $ about x=2
Mar 17, 2014
question
3
Calculate $ E(X) $ where $f(x,y) = \frac{1}{y}e^{-(y+\frac{x}{y})}$
May 1, 2017
question
3
Probability of at most 2 men entering a drugstore
Apr 29, 2017
question
3
Prove that a doubly stochastic matrix is a square matrix
Jan 29, 2017
Top network posts
View all network posts
35
Why not use hashing/hash tables for everything?
18
Find the longest subarray that contains a majority element
13
Generate ladder of integers using the least number of unique characters (in C++)
11
Generate ladder of integers using the least number of unique characters (in C++)
9
Minimum-cut with minimum number of edges