Evaluating an Infinite Series (non geometric)

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SUMMARY

The discussion focuses on evaluating the limit of the infinite series defined by the expression lim n->infinity of Sum (from k = 1 to n) of sqrt(k/n) * 1/n. The correct evaluation leads to the result of 2/3, which is derived from recognizing that the sum approximates the integral of a function from 0 to 1 as n approaches infinity. The initial approach incorrectly suggested divergence, but the integral approximation clarifies the convergence to 2/3.

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  • Understanding of limits in calculus
  • Familiarity with Riemann sums
  • Knowledge of integral calculus
  • Basic concepts of Taylor series
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  • Study Riemann sums and their relationship to definite integrals
  • Explore the concept of convergence in infinite series
  • Learn about Taylor series and their applications in approximating functions
  • Investigate techniques for evaluating limits of sequences and series
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Students studying calculus, particularly those focusing on series and integrals, as well as educators seeking to clarify the relationship between summation and integration.

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Homework Statement



http://bit.ly/9N9iLZ

Evaluate:
lim n-> infinity of Sum (from k = 1 to n) of sqrt(k/n) * 1/n

Homework Equations


taylor series?


The Attempt at a Solution


the above = lim n->infinity of Sum (from k = 1 to n) of k^1/2 / n^3/2
k approaches n so
n^1/2 / n^3/2 -> 1/n -> diverge

correct answer is 2/3 i have no idae how to get it help
 
Physics news on Phys.org
Your sum is the approximation of an integral of a certain function from 0 to 1 with n values. If n->inf then the limit of the approximation becomes is the integral.
 

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