#842 · Algebra · Sequences & series

Number of terms for a sum

How many terms of the arithmetic series $9, 12, 15, \dots$ must be taken so that their sum is $306$ ?

~2 minAnswer checked instantlysum of arithmetic series

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. IV. Arithmetical Progression, Examples IV.b, No. 16

Stuck? A gentle nudge

Something off?

Workspace

Your answer

Loading the math keyboard…

Type naturally — sqrt, pi, / and ^ become notation. Any equivalent form is accepted. Press Enter to check.