The first term of an arithmetic progression is and its common difference is . What is the sum of its first terms?
Answer and explanation
Correct answer: B. 416
- Step 1: State the formula for the sum of the first terms of an arithmetic progression: , where is the first term and is the common difference.
- Step 2: Substitute , , and : .
- Step 3: Evaluate the product: .
Answer
416.
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