Arithmetic series calculation: The series is a finite arithmetic series where each term is the negative of the index n. We will calculate each term and add them together.
First term calculation: First term: when n=0, the term is (−0) which equals 0.
Second term calculation: Second term: when n=1, the term is (−1) which equals −1.
Third term calculation: Third term: when n=2, the term is (−2) which equals −2.
Sum calculation: Now, we add all the terms together: 0+(−1)+(−2).
Final result: The sum is 0−1−2, which equals −3.
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