Difference between revisions of "2024 AMC 8 Problems/Problem 4"

(solution one very fast and efficient must see)
(Problem)
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<math>Yunji is dumb</math>
 
<math>Yunji is dumb</math>
  
🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦
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      _.---._    /\
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    ./'      "--`\//
🟦🟦🟦🟦🟦🟦🟦🟦🟦⬛⬛⬛🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦⬛⬛⬛🟦🟦🟦🟦🟦🟦🟦🟦
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  ./              o \          .-----.
🟦🟦🟦🟦🟦🟦🟦🟦⬛⬛⬛⬛🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦🟦⬛⬛⬛⬛🟦🟦🟦🟦🟦🟦🟦
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/./\  )______  \__ \        ( help! )
🟦🟦🟦🟦🟦🟦🟦⬛⬛⬛⬛🟦🟦🟦🟦⬛⬛🟦🟦🟦⬛⬛🟦🟦🟦🟦⬛⬛⬛⬛🟦🟦🟦🟦🟦🟦
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./  / /\ \  | \ \  \ \      /`-----'
🟦🟦🟦🟦🟦🟦⬛⬛⬛⬛⬛⬛🟦🟦⬛⬛⬛⬛🟦⬛⬛⬛⬛🟦🟦⬛⬛⬛⬛⬛⬛🟦🟦🟦🟦🟦
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  / /  \ \  | |\ \  \7--- ooo ooo ooo ooo ooo ooo
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🟦🟦🟦🟦🟦⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛🟦⬛⬛⬛⬛⬛⬛⬛🟦🟦🟦🟦
 
🟦🟦🟦🟦🟦⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛🟦🟦🟦🟦
 
🟦🟦🟦🟦🟦⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛🟦🟦🟦🟦
 
🟦🟦🟦🟦🟦⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛🟦🟦🟦🟦
 
🟦🟦🟦🟦🟦⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛🟦🟦🟦🟦
 
🟦🟦🟦🟦🟦⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛🟦🟦🟦🟦
 
🟦⬛⬛⬛🟦⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛🟦⬛⬛🟦
 
🟦⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛🟦
 
🟦⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛⬛🟦
 
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🟦🟦🟦⬛⬛⬛⬛⬛⬛⬛🟩⬛⬛🟩🟩⬛⬛⬛⬛⬛⬛🟩🟩⬛⬛🟩⬛⬛⬛⬛⬛⬛⬛🟦🟦🟦
 
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==wapjgpoaewhgawehgoihewoighoiwhg[owrh[oigawh[oghw[aw==
 
==wapjgpoaewhgawehgoihewoighoiwhg[owrh[oigawh[oghw[aw==

Revision as of 21:51, 7 February 2024

Problem

When Yunji added all the integers from $1$ to $9$, she mistakenly left out a number. Her incorrect sum turned out to be a square number. What number did Yunji leave out?

$Yunji is dumb$

      _.---._    /\\
   ./'       "--`\//
 ./              o \          .-----.
/./\  )______   \__ \        ( help! )

./ / /\ \ | \ \ \ \ /`-----'

  / /  \ \  | |\ \  \7--- ooo ooo ooo ooo ooo ooo

wapjgpoaewhgawehgoihewoighoiwhg[owrh[oigawh[oghw[aw

Roses are red

violets are blue

Grass is green

Chair

Solution 3

Recall from AMC12A 2022 Problem 16, that $1+2+\dots+8 = 6^2$. Hence removing $9$ works and our answer is $\boxed{\textbf{(E) }9}$.

-iamcalifornia'sresidentidiot

Solution 4

using the theory of relativity, 1+5 is 4 so therefore Mark Zuckerburg is a lizard person and the earth is actually flat, which proves the pythagorean theorom

-by random_uwu_gamer_girl

BAN ME I DARE YOU I ACTUALLY DARE

Video Solution 1 (easy to digest) by Power Solve

https://youtu.be/HE7JjZQ6xCk?si=sTC7YNSmfEOMe4Sn&t=179

Video Solution by Math-X (First fully understand the problem!!!)

https://youtu.be/BaE00H2SHQM?si=9ZUxEGmGam7il9xr&t=907

~Math-X


Video Solution by NiuniuMaths (Easy to understand!)

https://www.youtube.com/watch?v=Ylw-kJkSpq8

~NiuniuMaths

Video Solution 2 by SpreadTheMathLove

https://www.youtube.com/watch?v=L83DxusGkSY

Video Solution by CosineMethod [🔥Fast and Easy🔥]

https://www.youtube.com/watch?v=9v5q5DxeriM

Video Solution by Intersigation

https://youtu.be/ktzijuZtDas&t=232

See Also

2024 AMC 8 (ProblemsAnswer KeyResources)
Preceded by
Problem 3
Followed by
Problem 5
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
All AJHSME/AMC 8 Problems and Solutions

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