licite formula for the sum (assuming n is a multiple of 3)  Q= 1·1 + 2·2 + 3·3 + 1 · 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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find an explicite formula for the sum (assuming n is a multiple of 3) 

Q= 1·1 + 2·2 + 3·3 + 1 · 4 + 2 · 5 + 3 · 6 + ... + 1 · (n − 2) + 2 · (n − 1) + 3 · n

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