Two envelopes problem

en

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Two envelopes problem

Quality:

Two envelopes problem - brain teaser, puzzle, or paradox in logic, probability, and recreational mathematics. Article “Two envelopes problem” in English Wikipedia has 60.1 points for quality (as of July 1, 2026). The article contains 48 references and 18 sections.

In this language version of Wikipedia the article has the best quality. Also, this article is the most popular in that (English) language version.

Since the creation of article “Two envelopes problem”, its content was written by 314 registered users of English Wikipedia and edited by 704 registered Wikipedia users in all languages.

The article is cited 156 times in English Wikipedia and cited 279 times in all languages.

The highest Authors Interest rank from 2001:

  • Local (English): #4981 in November 2014
  • Global: #12144 in February 2005

The highest popularity rank from 2008:

  • Local (English): #8981 in October 2013
  • Global: #22159 in October 2013

There are 14 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2026 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

Languages with the highest quality

#LanguageQuality gradeQuality score
1English (en)
Two envelopes problem
60.1313
2German (de)
Umtauschparadoxon
36.5468
3Serbian (sr)
Проблем две коверте
25.3999
4Ukrainian (uk)
Задача про два конверти
22.0708
5Hungarian (hu)
Kétborítékos paradoxon
21.1218
6French (fr)
Paradoxe des deux enveloppes
19.2374
7Persian (fa)
پارادوکس دو پاکت
17.0217
8Italian (it)
Paradosso delle due buste
16.0712
9Russian (ru)
Задача о двух конвертах
15.0433
10Hebrew (he)
פרדוקס המעטפות
11.2131
More...

The following table shows the most popular language versions of the article.

Most popular in all the time

The most popular language versions of the article "Two envelopes problem" in all the time
#LanguagePopularity awardRelative popularity
1English (en)
Two envelopes problem
1 927 951
2Russian (ru)
Задача о двух конвертах
409 071
3German (de)
Umtauschparadoxon
155 430
4Italian (it)
Paradosso delle due buste
89 754
5French (fr)
Paradoxe des deux enveloppes
76 794
6Hebrew (he)
פרדוקס המעטפות
61 701
7Spanish (es)
Paradoja de los dos sobres
38 024
8Dutch (nl)
Enveloppenparadox
29 413
9Hungarian (hu)
Kétborítékos paradoxon
18 907
10Czech (cs)
Paradox dvou obálek
17 698
More...

The following table shows the language versions of the article with the highest popularity in the last month.

Most popular in June 2026

The most popular language versions of the article "Two envelopes problem" in June 2026
#LanguagePopularity awardRelative popularity
1English (en)
Two envelopes problem
3 280
2Russian (ru)
Задача о двух конвертах
480
3French (fr)
Paradoxe des deux enveloppes
322
4German (de)
Umtauschparadoxon
250
5Hebrew (he)
פרדוקס המעטפות
141
6Polish (pl)
Paradoks dwóch kopert
110
7Persian (fa)
پارادوکس دو پاکت
86
8Italian (it)
Paradosso delle due buste
65
9Dutch (nl)
Enveloppenparadox
47
10Czech (cs)
Paradox dvou obálek
32
More...

The following table shows the language versions of the article with the highest Authors’ Interest.

The highest AI

Language versions of the article "Two envelopes problem" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.
#LanguageAI awardRelative AI
1English (en)
Two envelopes problem
314
2German (de)
Umtauschparadoxon
90
3Russian (ru)
Задача о двух конвертах
67
4French (fr)
Paradoxe des deux enveloppes
53
5Italian (it)
Paradosso delle due buste
43
6Hebrew (he)
פרדוקס המעטפות
36
7Dutch (nl)
Enveloppenparadox
23
8Hungarian (hu)
Kétborítékos paradoxon
22
9Serbian (sr)
Проблем две коверте
12
10Spanish (es)
Paradoja de los dos sobres
11
More...

The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

The highest AI in June 2026

Language versions of the article "Two envelopes problem" with the highest AI in June 2026
#LanguageAI awardRelative AI
1Czech (cs)
Paradox dvou obálek
0
2German (de)
Umtauschparadoxon
0
3English (en)
Two envelopes problem
0
4Spanish (es)
Paradoja de los dos sobres
0
5Persian (fa)
پارادوکس دو پاکت
0
6French (fr)
Paradoxe des deux enveloppes
0
7Hebrew (he)
פרדוקס המעטפות
0
8Hungarian (hu)
Kétborítékos paradoxon
0
9Italian (it)
Paradosso delle due buste
0
10Dutch (nl)
Enveloppenparadox
0
More...

The following table shows the language versions of the article with the highest number of citations.

The highest CI

Language versions of the article "Two envelopes problem" with the highest Citation Index (CI)
#LanguageCI awardRelative CI
1English (en)
Two envelopes problem
156
2Ukrainian (uk)
Задача про два конверти
80
3Russian (ru)
Задача о двух конвертах
10
4Hebrew (he)
פרדוקס המעטפות
9
5German (de)
Umtauschparadoxon
6
6French (fr)
Paradoxe des deux enveloppes
6
7Spanish (es)
Paradoja de los dos sobres
4
8Italian (it)
Paradosso delle due buste
3
9Dutch (nl)
Enveloppenparadox
2
10Serbian (sr)
Проблем две коверте
2
More...

Scores

Estimated value for Wikipedia:
English:
Global:
Popularity in June 2026:
English:
Global:
Popularity in all years:
English:
Global:
Authors in June 2026:
English:
Global:
Registered authors in all years:
English:
Global:
Citations:
English:
Global:

Quality measures

Interwikis

#LanguageValue
csCzech
Paradox dvou obálek
deGerman
Umtauschparadoxon
enEnglish
Two envelopes problem
esSpanish
Paradoja de los dos sobres
faPersian
پارادوکس دو پاکت
frFrench
Paradoxe des deux enveloppes
heHebrew
פרדוקס המעטפות
huHungarian
Kétborítékos paradoxon
itItalian
Paradosso delle due buste
nlDutch
Enveloppenparadox
plPolish
Paradoks dwóch kopert
ruRussian
Задача о двух конвертах
srSerbian
Проблем две коверте
ukUkrainian
Задача про два конверти

Popularity rank trends

Best Rank English:
#8981
10.2013
Global:
#22159
10.2013

AI rank trends

Best Rank English:
#4981
11.2014
Global:
#12144
02.2005

Local popularity rank history

Local AI rank history

Languages comparison

Important global interconnections (July 2025 – June 2026)

Wikipedia readers most often find their way to information on Two envelopes problem from Wikipedia articles about Monty Hall problem, List of paradoxes, Boy or Girl paradox, Bertrands box paradox and Three Prisoners problem. Whereas reading the article about Two envelopes problem people most often go to Wikipedia articles on St. Petersburg paradox, Boy or Girl paradox, Sleeping Beauty problem, Newcombs problem and Bertrand paradox.

Cumulative results of quality and popularity of the Wikipedia article

List of Wikipedia articles in different languages (starting with the most popular):

News from 1 July 2026

On 1 July 2026 in multilingual Wikipedia, Internet users most often read articles on the following topics: 2026 FIFA World Cup, Kylian Mbappé, Erling Haaland, Democratic Republic of the Congo, FIFA World Cup, Harry Kane, Romelu Lukaku, Senegal, Michael Olise, Sadio Mané.

In English Wikipedia the most popular articles on that day were: 2026 FIFA World Cup, Harry Kane, Julián Quiñones, List of FIFA World Cup top goalscorers, Kylian Mbappé, Democratic Republic of the Congo, Erling Haaland, DR Congo national football team, Melat Kiros, FIFA World Cup.

About WikiRank

The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 50 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2026. When calculating current popularity and AI of articles data from June 2026 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2026... More information