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      Question

      Find the sum of the first 15 natural

      numbers.
      A 105 Correct Answer Incorrect Answer
      B 110 Correct Answer Incorrect Answer
      C 120 Correct Answer Incorrect Answer
      D 115 Correct Answer Incorrect Answer

      Solution

      Sum of first 'n' natural numbers = n(n + 1) Ă· 2
      Required sum = 15 Ă— (15 + 1) Ă· 2 = 15 Ă— 16 Ă· 2 = 120

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