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n + n² + n³ + n^4 + n^5 + n^6 = 9n + 9n² + 9n³
n^4 + n^5 + n^6 = 9n + 9n² + 9n³ - n - n² - n³
n^4 + n^5 + n^6 = 8n + 8n² + 8n³
n(n³ + n^4 + n^5) = n(8 + 8n + 8n²)............(Se van las "n")
n³ + n^4 + n^5 = 8 + 8n + 8n²
n³(1 + n + n²) = 8(1 + n + n²).......................(Se van "1 + n + n²")
n³ = 8
n = ³√8
n = 2
n + n² + n³ + n^4 + n^5 + n^6 = 2 + 4 + 8 + 16 + 32 + 64
x2 x2 x2 x2 x2
Razón = k = 2