Question 72Asked in BPSC TRE 2.0 (2023) Mathematics Class 9-10 (Re-exam)

Evaluate: lim (n→∞) ∑ (k = 0 to n) n / (k² + n²)मूल्यांकन करें:

Evaluate: lim (n→∞) ∑ (k = 0 to n) n / (k² + n²)
मूल्यांकन करें: lim (n→∞) ∑ (k = 0 से n) n / (k² + n²)
  1. Aπ/2π/2
  2. Bππ
  3. Cπ/4π/4
  4. DMore than one of the aboveउपर्युक्त में से एक से अधिक
  5. ENone of the aboveउपर्युक्त में से कोई नहीं
Show answerHide answer

Correct answer: (C) π/4π/4

Explanation

Write the term as (1/n)·1/(1 + (k/n)²); the sum is a Riemann sum for ∫₀¹ dx/(1 + x²) = tan⁻¹(1) = π/4.पद को (1/n)·1/(1 + (k/n)²) के रूप में लिखने पर योग ∫₀¹ dx/(1 + x²) का रीमान योग है, जिसका मान tan⁻¹(1) = π/4 है।

From BPSC TRE 2.0 (2023) Mathematics Class 9-10 (Re-exam) — Previous Year Paper

This is question 72 of BPSC TRE 2.0 (2023) Mathematics Class 9-10 (Re-exam) — Previous Year Paper. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.