Further MathematicsSequences and seriesWAEC
Find the sum of the first 20 terms of the arithmetic progression 2, 5, 8, ...
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Answer: A. 610
S = n/2[2a + (n − 1)d] = 10[4 + 57] = 610.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.