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Question: how to seq and sum over a range of subscript

Question:how to seq and sum over a range of subscript

alljoyland 20 Maple
subscript sum
January 27 2015
1

we always have subscript variable in the math book, but how could this be natral done in maple

I want to get a seq a1 a2 a3

seq(a[i],i=1..3)

but how could I get a  aij

seq(a[i_j],i=1..3);

and

seq(a[ij],i=1..3);  both was not right
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