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Converge Or Diverge Calculator Sequence . Find more transportation widgets in wolfram|alpha. The first step of the ratio test is to plug the original and modified versions of the power series into their respective locations in the formula. calculus determine whether the following sequence is convergent or from math.stackexchange.com Convergence when l < 1, l = lim n → ∞ | a n + 1 a n |. Find the first term by using the value of n from the geometric series formula. Aₙ = 1 * 2ⁿ⁻¹, where n is the position of said term in the sequence.