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Card 7 / 8:
ratio test
for a series ∑ n = 1 ∞ a n with nonzero terms, let ρ = lim n → ∞ | a n + 1 / a n | ; if 0 ≤ ρ < 1 , the series converges absolutely; if ρ > 1 , the series diverges; if ρ = 1 , the test is inconclusive
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