Newbie Questionshttps://www.infopathdev.com:443/forums/39.aspxNew to InfoPath? Search to see if your question has already been answered. If it has not, then ask it here or the appropriate topic forum.enCommunityServer 2007 SP3 (Build: 31118.962)Re: check last digithttps://www.infopathdev.com:443/forums/thread/78000.aspxThu, 26 Apr 2012 07:03:22 GMT033a2e2d-04e2-4a9d-be01-a4634161eefd:78000Jimmy0https://www.infopathdev.com:443/forums/thread/78000.aspxhttps://www.infopathdev.com:443/forums/commentrss.aspx?SectionID=39&PostID=78000<p>Try setting the default value formula for the option button field to this:</p><p>2 -&nbsp;(substring(<u>SocialSecurity</u>, string-length(<u>SocialSecurity</u>), 1) mod 2)</p>check last digithttps://www.infopathdev.com:443/forums/thread/77998.aspxThu, 26 Apr 2012 05:57:51 GMT033a2e2d-04e2-4a9d-be01-a4634161eefd:77998Tinker0https://www.infopathdev.com:443/forums/thread/77998.aspxhttps://www.infopathdev.com:443/forums/commentrss.aspx?SectionID=39&PostID=77998Infopath 2010 I Would like to check the last digit in a social security number if it&#39;s 1, 3, 5, 7, 9 then set option button value 1 else set option button value 2 how can this be done ?