If the sum of n terms of an A.P. is cn(n - 1) where c \neq 0, then | Filo
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Class 11

Math

Algebra

Sequences and series

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If the sum of terms of an A.P. is where , then sum of the squares of these terms is

  1. None of these
Correct Answer: Option(b)
Solution:
Let the be

Given



    
            



Required series


Sum of terms square







 

     since sum of square of first n natural numbers

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