GMAT 考满分题库

For each positive integer n, the quantity$$S_n$$ is defined such that $$S_{n+2}=({S_n})^2-S_{n+1}$$. In addition$$s_2=1$$; . In the table, select values for $$S_1$$ and $$S_4$$ that are jointly compatible with these conditions. Select only two values, one in each column.
$$S_1$$ $$S_4$$  
-12
-7
-3
-1

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