MathematicsProgressionsWAEC
Find the sum of the first 15 terms of the A.P. 7, 11, 15, …
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Answer: C. 525
S = 15/2 [14 + 14 × 4] = 7.5 × 70.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.
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