4) S(n) = 6 +5+6+7+8+ ... + (n - k) -1 + 2 + 3 + ... + (n-K) - 1-2-3-4
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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Question
Need help finding the sum

Transcribed Image Text:4) S(n)=6+5+6+7+8+...+ (n − k)
-1+2+3+...+(-k)-1-2-3
=(n-k)(n+1-k) - 10
=n² +h=nk-nk-K+K²-20
2
1= n² +K² -2nk+n-k-20
56)=
3-4
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