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They are just powers of 3

Algebra Level 3

What is the remainder when the polynomial $x+x^{3}+x^{9}+x^{27}+x^{81}+x^{243}$ is divided by $x^2-1$ ?

NMTC problem.

6x

None of these choices

1

2x

4x

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by Akshat Sharda

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