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Q.
- Arithmetic series definition: The series is a simple arithmetic series where each term is given by . We will evaluate each term separately and then sum them up.
- First term calculation: First term when : .
- Second term calculation: Second term when : .
- Third term calculation: Third term when : .
- Summing up the terms: Now, we sum up all the terms: .
- Calculating the sum: Calculating the sum: .
