Expanding a sum without evaluating it – mathematica.stackexchange.com

I am currently trying to expand a sum without evaluating it, e.g. $$\sum_{i=0}^5 i^2 = 1^2+2^2+3^2+4^2+5^2$$ So I am trying to create a function SumExpansion[expr_, {i_, a_, b_}] which outputs ...

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