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      Question

      Find the sum of the first 20 natural numbers.

      A 215 Correct Answer Incorrect Answer
      B 205 Correct Answer Incorrect Answer
      C 210 Correct Answer Incorrect Answer
      D 265 Correct Answer Incorrect Answer

      Solution

      Sum of first n natural numbers = n(n + 1) / 2 For n = 20: Sum = 20 Ă— 21 / 2 = 10 Ă— 21 = 210.

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