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Deepak Bora
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Find the number of terms of the AP 64,60,56,……so that their sum is 544. Explain the double answer.

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This is the Important question based on Arithmetic progression Chapter of R.S Aggarwal book for ICSE & CBSE Board.
Here you have to find the
(i) Number of terms so that their sum is Given
(ii)Explain the double answer
Question Number 21 Of Exercise 11 C of RS Aggarwal Solution.

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1 Answer

  1. The given AP is 64,60,56,……………….

    We know that,

    First term (a) = 64

    Common difference =  = 60-64 = -4

    Given sum of AP  () = 544

     

    By using formula:-

    ⇒  

    ⇒  

    ⇒  

    ⇒ 

    ⇒ 

    ⇒      and     

    ⇒ n = 16             and     n = 17

    so, for the values n=16 and n=17  the sum of  the given A.P.  is 544.

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