report this ad
Random Quiz
Quizzes
Featured
Popular
Type
Ratings
Favorites
Difficulty
Length
Date
Guides
Categories
Overview
Sports
Geography
Music
Movies
Television
Just For Fun
Miscellaneous
History
Literature
Language
Science
Gaming
Entertainment
Religion
Holiday
Quiz Lab
Summary
Popular
Recent
Games to Consider
Editor Picks
Curator Picks
Create
Dashboard
Create a Quiz
Playlist Dashboard
FAQ
Creation Guides
Groups
Popular
Your Groups
Sporcle News
Recent Discussions
Add a New Topic
Achievements
All Badges
Newest
Oldest
Leaderboards
Sporcle Live
Overview
Locations & Scores
Leagues
Theme Nights
Pub Owners
Private Events
Contact
Become a Host
×
Find the Mistake: 2=1 Proof
Random
Just For Fun
or
Numbers
Quiz
Can you name the mistake in this proof that 2=1?
by
mrsiriustab
Quiz not verified by Sporcle
Popular Today
Food, Drink, and Poison Sorting Blitz
14,759
Find the US States - No Outlines Minefield
8,581
Pixar Movies: Then to Now
8,512
Questioning Movie Quotes IV?
7,676
Find the 5-Letter Countries
7,226
And more...
plays
Rate 5 stars
Rate 4 stars
Rate 3 stars
Rate 2 stars
Rate 1 star
How to Play
Click the green button to start and enter the correct answers below
Read the first comment for instructions.
Also try:
April Fools (Cough Cough) Logic Puzzle
Challenge
Share
Tweet
Embed
Score
0
/10
ll
Timer
04:00
Play
Enter mistake:
You got
%
Avg Score
%
Try Again
Share Results
Quiz Stats
Play Another
Proof
Where is it?
Explanation
Do this!
It is required!
1. x=y≠0
Given
2. x^2=xy
Multiply by x
3. x^2-y^2=xy-y^2
Subtract y^2
4. (x+y)(x-y)=y(x-y)
Factoring
5. x+y=y
Dividing by x-y
6. y+y=y
Substitution: x=y
7. 2y=y
Combining like terms
8. 2=1
Dividing by y, knowing y≠0
Is there any mistake in the proof?
(Fills in upon completion of the quiz)
1. x=y≠0
(Fills in upon completion of the quiz)
2. x^2=xy
(Fills in upon completion of the quiz)
3. x^2-y^2=xy-y^2
(Fills in upon completion of the quiz)
4. (x+y)(x-y)=y(x-y)
(Fills in upon completion of the quiz)
5. x+y=y
(Fills in upon completion of the quiz)
6. y+y=y
(Fills in upon completion of the quiz)
7. 2y=y
(Fills in upon completion of the quiz)
8. 2=1
(Fills in upon completion of the quiz)
Is there any mistake in the proof?
(Fills in upon completion of the quiz)
report this ad
You're not logged in!
Compare scores with friends on all Sporcle quizzes.
Connect with Facebook
Connect with Google
Sign Up with Email
OR
Log In
Remember Me
Forgot?
Log In
You Might Also Like...
Missing Number Minefield
Lively Letters Logic Puzzle
Crazy Number Logic Puzzle
(warning: may contain spoilers)
Show Comments
Extras
Curator's Pick
Report
Nominate
Tags:
April Fools'
,
Logic
,
math
,
Numbers
,
broken
,
equal
,
one
,
three
,
two
,
weird
report this ad
Go to the Sporcle.com Mobile Site →

## Show Comments