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Answers and rating deltas for

What does '??' mean in C#?

Author Votes Δ
djdd87 13 +0.55
Martin Hennings 5 +3.45
LukeH 4 -0.20
MrDosu 2 +0.23
Peter 1 -2.25
Øyvind Bråthen 1 -1.80
Andrea Parodi 1 -2.01
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