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KCET2024MathematicsLimits

_ n ( n n^2+1^2 + n n^2+2^2 + n n^2+3^2 + + 1 5 n )=

Options

  1. A/ 4
  2. B⁻¹ 3
  3. C⁻¹ 2
  4. D/ 2

Correct answer

C. ⁻¹ 2

Step-by-step solution

_ n ( n n^2+1^2 + n n^2+2^2 + n n^2+3^2 + + 1 5 n )= _ n ( n n^2+1^2 + n n^2+2^2 + n n^2+3^2 + + n n^2+(2 n)^2 )= _ n _ r=1 ^ 2 n n n^2+r^2 = _ n _ r=1 ^ 2 n 1 n ( 1 1+ ( r n )^2 )= ₀^2 d x 1+x^2 = ⁻¹(2)

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