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

  1. 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.
  2. Step 2: Substitute , , and : .
  3. Step 3: Evaluate the product: .
Answer
416.

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