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Question: Array indexing vs var in sum

Question:Array indexing vs var in sum

icegood 290
array sum index
November 29 2011
0

restart;
lucoef:=Array(0..4, (i->i^2+3));
j:=1;
lucoefnew:=sum (lucoef[r]*lucoef[j-r],r=0..j);

Error, bad index into Array

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