MathematicsProgressionsJAMB
How many terms of the AP 3, 7, 11, ... must be added to give 210?
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Answer: B. 10
Sₙ = n/2(6 + 4(n − 1)) = n(2n + 1) = 210, giving n = 10.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.