Difference between revisions of "2024 AMC 12B Problems/Problem 16"

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==Problem 16==
  
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A group of <math>16</math> people will be partitioned into <math>4</math> indistinguishable <math>4</math>-person committees. Each committee will have one chairperson and one secretary. The number of different ways to make these assignments can be written as <math>3^{r}M</math>, where <math>r</math> and <math>M</math> are positive integers and <math>M</math> is not divisible by <math>3</math>. What is <math>r</math>?
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<math>
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\textbf{(A) }5 \qquad
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\textbf{(B) }6 \qquad
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\textbf{(C) }7 \qquad
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\textbf{(D) }8 \qquad
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\textbf{(E) }9 \qquad</math>
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[[2024 AMC 12B Problems/Problem 16|Solution]]

Revision as of 01:05, 14 November 2024

Problem 16

A group of $16$ people will be partitioned into $4$ indistinguishable $4$-person committees. Each committee will have one chairperson and one secretary. The number of different ways to make these assignments can be written as $3^{r}M$, where $r$ and $M$ are positive integers and $M$ is not divisible by $3$. What is $r$?

$\textbf{(A) }5 \qquad \textbf{(B) }6 \qquad \textbf{(C) }7 \qquad \textbf{(D) }8 \qquad \textbf{(E) }9 \qquad$

Solution