#819 · Algebra · Sequences & series

First term of an AP

An arithmetic progression has 15 terms whose sum is 600 and common difference 5. Find the first term.

~2 minAnswer checked instantlyarithmetic progressionsum formula

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. IV. Arithmetical Progression, Examples IV.a, No. 19

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