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Answers and rating deltas for

Why is this code returning NaN?

Author Votes Δ
TMan 1 +2.80
Eduardo Almeida 1 +2.80
Gerard Sexton 1 +2.70
Neil 0 -0.09
jfriend00 0 -0.53
Nicholas Albion 0 -1.30
Lee Taylor 0 -2.02
Last visited: Sep 14, 2014, 5:07:29 AM