Further MathematicsSequences and seriesWAEC
Find the sum to infinity of 1 − 1/3 + 1/9 − 1/27 + ...
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Answer: B. 3/4
r = −1/3, so S∞ = 1/(1 + 1/3) = 3/4.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.