Which form is correct<br/><br/>"She has over 20 years' experience"<br/>"She has over 20 years of experience"<br/>"She has 20 years experience"<br/><br/>I'd go for the first but I'm not sure.<br/><br/>Any help is welcome.<br/><br/>Thanks <img class='emoticon' style='Width:19px;Height:19px;' data-delaysrc='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/1.gif' src='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/1.gif' alt='Emotion: smile'/>