#828 · Algebra · Sequences & series

Terms needed for a sum

How many terms of the arithmetic series $12, 16, 20, \dots$ must be taken so that their sum equals $208$ ?

~2 minAnswer checked instantlyarithmetic progressionsum formula

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. IV. Arithmetical Progression, Examples IV.b, No. 2

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