No.12033847 ViewReplyOriginalReport
[code:lit]s = 1 + 2 + 4 + 8 + ...
= 1 + 2 * (1 + 2 + 4 + 8 + ...)
= 1 + s

s = 1 + 2 * s

s = -1

1 + 2 + 4 + 8 + ... = -1[/code:lit]