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      Question

      Sum of first 20 terms of an AP is 610. First term = 12.

      Find approximate common difference.
      A 2 Correct Answer Incorrect Answer
      B 28 Correct Answer Incorrect Answer
      C 19 Correct Answer Incorrect Answer
      D 46 Correct Answer Incorrect Answer

      Solution

      ATQ, → S = (n/2)[2a + (n–1)d] → 610 = 10(24 + 19d) → d = 37/19 ≈ 1.95 or 2

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