Difference between revisions of "2020 AIME I Problems/Problem 3"

Revision as of 15:49, 14 December 2020

Problem

A positive integer $N$ has base-eleven representation $\underline{a}\kern 0.1em\underline{b}\kern 0.1em\underline{c}$ and base-eight representation $\underline1\kern 0.1em\underline{b}\kern 0.1em\underline{c}\kern 0.1em\underline{a},$ where $a,b,$ and $c$ represent (not necessarily distinct) digits. Find the least such $N$ expressed in base ten.

video solution

https://youtu.be/SuVsBIz8pZ8

Solution

From the given information, $121a+11b+c=512+64b+8c+a \implies 120a=512+53b+7c$ . Since $a$ , $b$ , and $c$ have to be positive, $a \geq 5$ . Since we need to minimize the value of $n$ , we want to minimize $a$ , so we have $a = 5$ . Then we know $88=53b+7c$ , and we can see the only solution is $b=1$ , $c=5$ . Finally, $515_{11} = 621_{10}$ , so our answer is $\boxed{621}$ .

~ JHawk0224

Solution 2 (Official MAA)

The conditions of the problem imply that $121a + 11b + c = 512 + 64b + 8 c + a$ , so $120 a = 512+ 53b+7c$ . The maximum digit in base eight is $7,$ and because $120a \ge 512$ , it must be that $a$ is $5, 6,$ or $7.$ When $a = 5$ , it follows that $600=512 + 53b+7c$ , which implies that $88 = 53b+7c$ . Then $b$ must be $0$ or $1.$ If $b = 0$ , then $c$ is not an integer, and if $b = 1$ , then $7c = 35$ , so $c = 5$ . Thus $N = 515_\text{eleven}$ , and $N=5\cdot 121 + 1\cdot 11 + 5 = 621$ . The number $637_{\rm eleven} =1376_{\rm eight} = 766$ also satisfies the conditions of the problem, but $621$ is the least such number. Video Solution:

https://youtu.be/hZSBUXCX5hI

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+A positive integer <math>N</math> has base-eleven representation <math>\underline{a}\kern 0.1em\underline{b}\kern 0.1em\underline{c}</math> and base-eight representation <math>\underline1\kern 0.1em\underline{b}\kern 0.1em\underline{c}\kern 0.1em\underline{a},</math> where <math>a,b,</math> and <math>c</math> represent (not necessarily distinct) digits. Find the least such <math>N</math> expressed in base ten.
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2020 AIME I (Problems • Answer Key • Resources)
Preceded by Problem 2	Followed by Problem 4
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All AIME Problems and Solutions

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