Unable to select right radio button

Unable to select right radio button

i want to select a radio button by its class and its value.
As value of some groups have same value they are zerod to same option button.
code am using:

 if($("input[value='<%=ans[i]%>']").hasClass("q<%=i%>")){
                $("input[value='<%=ans[i]%>']").prop("checked",true)