The first 9 terms of a progression add up to 81, and… | StemPy Lab

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The first 9 terms of a progression add up to 81, and… | StemPy Lab

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The first 9 terms of a progression add up to 81, and the first 18 terms add up to 324. What is the first term?

MathematicsHardHigh School (9–10)GeneralAlgebra › Sequences and Series Olympiad

Created by StemPy Lab

The first $9$ terms of a progression add up to $81$ , and the first $18$ terms add up to $324$ . What is the first term?

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← A progression has the property that adding its first n terms always gives 3n² + n. Which number stands in position 20?Leela adds the terms of 54, 51, 48, … until the total is 513. How many terms can she have added? →

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