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      Question

      What is the sum of the first 14 terms of an arithmetic

      progression if the first term is -21 and last term is 40?
      A 113 Correct Answer Incorrect Answer
      B 143 Correct Answer Incorrect Answer
      C 133 Correct Answer Incorrect Answer
      D 123 Correct Answer Incorrect Answer

      Solution

      First term of AP = a = - 21 & last term = l = 40 Number of terms = n = 14 Sum of AP = n/2 (a + l)   = 14/2 (- 21 + 40) => 19 x 7 = 133

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