Problem Analysis #4

25.75s
3,162 toks
Problem Statement

Suppose the following limit is given:

limn[0,n](1+20569nx)69ne(67x)dx=pq,\lim_{n\to\infty} \int_{[0,n]} \left(1+\frac{205}{69n}x\right)^{-69n} e^{(-\frac{6}{7}x)}\,dx=\frac{p}{q},

where pp and qq are positive integers which are relatively prime. Find p2qp^2q.

oindent

Ground Truth
70609
Execution Trace
Reasoning Process

[THOUGHT] I will compute the expected limit by recognizing the integrand limit and then confirm the final arithmetic with Python. [/THOUGHT] [PYTHON]

Compute p^2 * q where the expected limit is 7/1441

p = 7 q = 1441 print(p**2 * q) [/PYTHON]

Tool Output
[PYTHON OUTPUT] 70609 [/PYTHON OUTPUT]
Reasoning Process

[THOUGHT] For each fixed (x), as (n\to\infty), [ \left(1+\frac{205}{69n}x\right)^{-69n} \to e^{-205x}. ] Thus the integrand converges pointwise to [ e^{-205x} e^{-\frac{6}{7}x} = e^{-\left(205+\frac{6}{7}\right)x} = e^{-\frac{1441}{7}x}. ] One can dominate the integrand by an exponentially decaying function independent of (n), so by dominated convergence the limit of the integrals equals the integral of the limit: [ \lim_{n\to\infty} \int_0^n \left(1+\frac{205}{69n}x\right)^{-69n} e^{-\frac{6}{7}x},dx = \int_0^\infty e^{-\frac{1441}{7}x},dx = \frac{1}{\frac{1441}{7}} = \frac{7}{1441}. ] Thus (p=7), (q=1441), so [ p^2 q = 7^2\cdot 1441 = 70609. ] [/THOUGHT] \boxed{70609}

Final Model Output
70609

Comparative Analysis (P4) (Average across runs)

Avg Time Taken

Deepseek-R1-distill-Qwen-32B (high)
140.9
Deepseek-V3.2
123.2
Gemini-3-Pro-Preview
90.8
GPT-oss-20B (high)
60.4
Solar-Pro-2 (31B)(high)
60.2
Grok-4.1-fast
38.4
HCX-007(high)
31.5
Gemma-3-27B
31.4
Qwen3-30B-A3B-2507
28.9
Llama-VARCO-8B-Instruct
21.3
GPT-5.1 (high)
19.0
Claude-Opus-4.5
16.4
A.X-4.0 (72B)
16.0
EXAONE-4.0.1-32B (high)
3.7

Avg Token Usage

Gemini-3-Pro-Preview
11241.0
Deepseek-V3.2
9874.7
Solar-Pro-2 (31B)(high)
9831.3
GPT-oss-20B (high)
9757.0
Grok-4.1-fast
7671.7
Qwen3-30B-A3B-2507
6266.7
HCX-007(high)
4190.3
Deepseek-R1-distill-Qwen-32B (high)
3984.0
Claude-Opus-4.5
3858.3
A.X-4.0 (72B)
3485.3
EXAONE-4.0.1-32B (high)
3238.3
GPT-5.1 (high)
3067.7
Llama-VARCO-8B-Instruct
2088.3
Gemma-3-27B
1705.7