serendipity 0 Junior Poster in Training

I have Windows Vista and MS Office 2007.
I am trying to generate a program using cut and paste to copy test answers sent online into an Excel spreadsheet and want to list IN ONE CELL, seperated by commas, the numbers of the answers that were wrong. So, if I have Column C1:C25 and C2, C5, C7 which are numbered 2,5,7 are wrong, in a different cell I would like to generate "2,5,7".
Thanks for help in advance!

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