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If somebody clicks on up-vote or down-vote accidentaly, what is the way to undo it? or shoudn't it ask for confirmation?

marked as duplicate by Mat, hims056, Danubian Sailor, Travis J, Flyk Jan 16 '14 at 8:42

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3
                     Click on upvote to give +1

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              Click again on upvote to undo your upvote

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    Click on the number to know how many +1 and -1 is given to this post

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                     Here this post got +124 and -1

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EDIT

To view vote count you must be a established-user

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