MathematicsState true/ false:If the n th  term of an A.P. is given by a n =4n−5  , then the sum of the first 25 terms of A.P. is 1175.

State true/ false:


If the n th  term of an A.P. is given by a n =4n5  , then the sum of the first 25 terms of A.P. is 1175.


  1. A
    True
  2. B
    False  

    Fill Out the Form for Expert Academic Guidance!l



    +91



    Live ClassesBooksTest SeriesSelf Learning



    Verify OTP Code (required)

    I agree to the terms and conditions and privacy policy.

    Solution:

    Given,
    a n =4n5   Then,
    a 1 =1 a 25 =95   Now, calculating the sum,
    S n = n 2 a+ a n S n = 25 2 1+95 S n =25 47 S n =1175  
    Therefore, the sum is 1175.
    Hence, option 1 is correct.
     
    Chat on WhatsApp Call Infinity Learn

      Talk to our academic expert!



      +91


      Live ClassesBooksTest SeriesSelf Learning




      Verify OTP Code (required)

      I agree to the terms and conditions and privacy policy.