Further MathematicsSequences and seriesWAEC
Find the sum of the first five terms of the geometric series 2 + 6 + 18 + ...
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Answer: A. 242
S₅ = a(r⁵ − 1)/(r − 1) = 2(243 − 1)/2 = 242.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.