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Find-all-n-N-such-that-n-3-n-k-3-n-2-k-n-

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Question Number 121359 by liberty last updated on 07/Nov/20
Find all n∈N such that (n+3)^n = Σ_(k=3) ^(n+2) k^n
Findalln∈Nsuchthat(n+3)n=∑n+2k=3kn

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