Simple IF formula to display selected Radio buttons based on output

Hi Community. I have a simple document and wish to achieve this outcome: I have a dropdown with 3 options (A,B & C)...these have corresponding values of 1,2 & 3. If I select option A...the output = 1 (and so on). I also have 3 sets of Radio buttons...which need to be displayed based on outcome of users selection of dropdown. If I select Option A, only the first set of radio buttons need to be visible...If I select Option B - both the first and second set of radio buttons need to be visible...and I select option C...all 3 sets need to be visible. I have placed 3 formula fields on the document with this structure: if([DROPDOWN]>=1,1,0) / if([DROPDOWN]>=2,1,0) / if([DROPDOWN]>=3,1,0). I have set up conditional fields so if Formula 1 is satisfied (i.e. it outputs a value of 1 because the logic is satisfied) - show only the first set of radio buttons...and extended this for formula 2 & 3. But I cant get this to work...I have tried everything I know of but feel the answer is simple!! Any help much appreciated. Tks in advance, Mike