EXCEL C/W i have 3 rows containing a list No,No,Yes and i would like a message

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sriboss

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error to pop if i chze mre than? EXCEL C/W i have 3 rows containing a list No,No,Yes and i would like a message error to pop if i chze mre than 1 yes to say sorry only able to enter 1 yes or somtin,my teacher told me to try use IF AND COUNTIF formula,...help pweex i cn get an A* if u tell me this,..im dng my GCSE digital application its like a special ICT :-) cheerz thanks in advance
 
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