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Question: Maple sum command syntax help

Question:Maple sum command syntax help

Red Horse 10 Maple 13
syntax sum
November 03 2011
0

I have 91 points and to take the sum of the y-coordinates, I do

sum('points[k,2]','k'=1..91);

 

But if I want to take the sum of the points on just the even indeces i.e k=2, 4, 6, 8, 10...etc, I try to do

sum('points[2k,2]','2k'=1..91)     

but Maple gives me an error. I'm doing something wrong here. Help me please me fix the syntax error!!
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