MathematicsProgressionsWAEC
Find the sum of the first 15 terms of the arithmetic progression 4, 7, 10, ...
Show answer
Answer: C. 375
S₁₅ = 15/2 × (2 × 4 + 14 × 3) = 7.5 × 50 = 375.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.