2007 AMC 12A Problems/Problem 24

Problem

For each integer $n>1$ , let $F(n)$ be the number of solutions to the equation $\sin{x}=\sin{(nx)}$ on the interval $[0,\pi]$ . What is $\sum_{n=2}^{2007} F(n)$ ?

$\mathrm{(A)}\ 2014524 \mathrm{(B)}\ 2015028 \mathrm{(C)}\ 2015033 \mathrm{(D)}\ \2016532 \mathrm{(E)}\ 2017033$ (Error compiling LaTeX. Unknown error_msg)

Solution

$F(2)=3$

By looking at various graphs, we obtain that

$F(n+1)=F(n)+1$

$3+4+5+\cdots+2008=2017033$ $\mathrm{(E)}$

2007 AMC 12A (Problems • Answer Key • Resources)
Preceded by Problem 23	Followed by Problem 25
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2007 AMC 12A Problems/Problem 24

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