Sum of a series: Difference between revisions

→‎{{header|TXR}}: Correction in comment.
(→‎{{header|TXR}}: Variant D.)
(→‎{{header|TXR}}: Correction in comment.)
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sum="1.64393456668156"</lang>
 
Variant D: bring Variant B's summationinverse square calculation into the fold, eliminating mapcar. Final answer.
 
<lang txr>txr -c '@(bind sum @[reduce-left (op + @1 (/ 1.0 (* @2 @2))) (range 1 1000) 0])'
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