The first term of an arithmetic series is 3, the common difference is 5 and there are 10 terms. What is the sum?

Answer and explanation

Correct answer: D. 255

  1. Step 1: The last term is 3 + 9 x 5 = 48.
  2. Step 2: S = n(a + l)/2 = 10 x (3 + 48)/2 = 255.
Answer
255.

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