MathematicsFind the Sn for the following arithmetic series described: a = 5, n = 30, ℓ = 121

Find the Sn for the following arithmetic series described: a = 5, n = 30, ℓ = 121


  1. A
    1540
  2. B
    1680
  3. C
    1710
  4. D
    1890 

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    Solution:

    Given, a = 5, n = 30, ℓ = 121
    Sn=n2a+l
    =3025+121
    =15×126
    =1890
    Hence, The correct option is (4).
     
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