1994 AHSME Problems/Problem 6
Problem
In the sequence each term is the sum of the two terms to its left. Find .
Solution
We work backwards to find .
\begin{align*}d+0=1&\implies d=1\\ c+1=0&\implies c=-1\\ b+(-1)=1&\implies b=2\\ a+2=-1&\implies a=\boxed{\textbf{(A) }-3.} (Error compiling LaTeX. Unknown error_msg)
--Solution by TheMaskedMagician