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- Updated: 29.01.2025
- Android version: 5.0
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- Google Play: -
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# 2015 AMC 10A Problems/Problem 1.
## Contents.
1 Problem
2 Solution
3 Video Solution
4 See Also
## Problem
What is the value of \[2-4+6-8+10-12+14-16+18-20+22?\]
$\textbf{(A)}\ -110\qquad\textbf{(B)}\ -44\qquad\textbf{(C)}\ 0\qquad\textbf{(D)}\ 22\qquad\textbf{(E)}\ 44$
## Solution.
We can group the terms into pairs of two, and notice that each pair sums to $-2$. There are $11$ pairs, so the sum is $11 \cdot (-2) = \boxed{\textbf{(B)}\ -44}$.
## Video Solution.
https://youtu.be/8SbJpYmzjzQ
~savannahsolver
<|endoftext|>## Mathematical Forums
## Category: High School Olympiads
## Topic: Inequality
## Views: 389
## [enter: math-user1, num_posts=697, num_likes_received=372]
## [math-user1, num_likes=1]
Let $a,b,c>0$. Prove that
$\frac{a^2}{b}+\frac{b^2}{c}+\frac{c^2}{a}+3\sqrt[3]{abc}\geq 2(a+b+c)$
## [enter: math-user2, num_posts=545, num_likes_received=72]
## [math-user2, num_likes=0]
By AM-GM we have $\frac{a^2}{b}+\frac{b^2}{c}+\frac{c^2}{a}+3\sqrt[3]{abc}\ge4\sqrt[4]{\frac{a^2}{b}\frac{b^2}{c}\frac{c^2}{a}3\sqrt[3]{abc}}=4\sqrt[4]{3abc}$ and by AM-GM again we have $4\sqrt[4]{3abc}\ge2(a+b+c)$
## [math-user
