Prove that Σ n1+n2+n3=n (₁ ₁) (-1)³₁-² n n1 N2 N3 (-1)^1-n2+3 = 1, where the summation extends over all nonnegative integral solutions of n₁ +n₂+ n3 = n.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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1. Prove that
Σ
ni+n2+n3=n
₁) (-1)¹₁-
n
n1 N2 N3
(-1)1-n2+3 = 1,
where the summation extends over all nonnegative integral solutions of n₁ +n₂+
n3 = n.
Transcribed Image Text:1. Prove that Σ ni+n2+n3=n ₁) (-1)¹₁- n n1 N2 N3 (-1)1-n2+3 = 1, where the summation extends over all nonnegative integral solutions of n₁ +n₂+ n3 = n.
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