15) Find an and a21 for the arithmetic sequence for which S₁7 = 187 and a₁7 = - 13. Hint: Use the formulas for Sn. an- a21.
15) Find an and a21 for the arithmetic sequence for which S₁7 = 187 and a₁7 = - 13. Hint: Use the formulas for Sn. an- a21.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:15) Find an and a21 for the arithmetic sequence for which S17
Hint: Use the formulas for Sn.
=
= 187 and a17 = - 13.
an
a21-
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