<input type=radio name='radio-1'>radio-1.1
<input type=radio name='radio-1'>radio-1.2
<input type=radio name='radio-1'>radio-1.3
<br>
<input type=radio name='radio-2'>radio-2.1
<input type=radio name='radio-2'>radio-2.2
<input type=radio name='radio-2'>radio-2.3
<br>
<input type=radio name='radio-3'>radio-3.1
<input type=radio name='radio-3'>radio-3.2
<input type=radio name='radio-3'>radio-3.3
<br>
<br> Seçildi: <b id=selectedRadioCount></b>
<br> Seçilmedi: <b id=unSelectedRadioCount></b>

::root{
  counter-reset: selectedRadioCount, unSelectedRadioCount;
}
input[type='radio']:nth-of-type(3n){
  counter-increment: unSelectedRadioCount;
}
input[type='radio']:nth-of-type(3n):checked{
  counter-increment: selectedRadioCount;
}
input[type='radio']:not(:nth-of-type(3n)):checked{
  counter-increment: unSelectedRadioCount -1 selectedRadioCount;
}
#selectedRadioCount::before{
  content: counter(selectedRadioCount);
}
#unSelectedRadioCount::before{
  content: counter(unSelectedRadioCount);
}