Stack Exchange
sign up
|
log in
|
Mathematics
Questions
Tags
Tour
Users
Ask Question
MarkT
less info
network profile
66
reputation
3
bio
website
location
age
visits
member for
5 months
seen
Jan 13 at 23:17
stats
profile views
0
66
reputation
bio
website
visits
member for
5 months
3
badges
location
seen
Jan 13 at 23:17
summary
answers
questions
tags
badges
favorites
bounties
reputation
activity
2
Answers
newest
activity
votes
5
How to prove that $\sum_{r=0}^n\binom{n}{r}2^r=3^n$
0
Not empty omega limit set
Mathematics Stack Exchange works best with JavaScript enabled