Problem 383

{{searchResults.length}} results for “{{searchWords}}” No results found for “{{searchWords}}” × back to contents

§{{x[0]}} {{x[1]}}

Table of Contents

Problem 383: (2010 AMC 12B, 20)

A geometric sequence $(a_n)$ has $a_1=\sin x$, $a_2=\cos x$, and $a_3= \tan x$ for some real number $x$. For what value of $n$ does $a_n=1+\cos x$? $\textbf{(A)}\ 4 \qquad$ $ \textbf{(B)}\ 5 \qquad$ $ \textbf{(C)}\ 6 \qquad$ $ \textbf{(D)}\ 7 \qquad$ $ \textbf{(E)}\ 8$

Solution

Exercise 383: Solution

A geometric sequence $(a_n)$ has $a_1=\sin x$, $a_2=1$, and $a_3=\tan x$ for some real number $x$. What is $a_6$?

Search Go to Prev Next

Contact Us