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## Homework Statement

I am trying to solve this problem and need help with one aspect.

## Homework Equations

sequence: 0,-1,0,1 -- repeated.

## The Attempt at a Solution

How do I make every 4th term of the sequence a negative number?

for instance i have: (1 + (-1)^n)/2 but i don't know how to alternative the -1 term in.

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