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$(function () {
   var $checked_radio_count = $(".radio_button_wrapper").find('input[type="radio"]:checked').size();
   var $radio_count = $(".radio_button_wrapper").size();

      if($checked_radio_count != $radio_count){
      return false;
<div class="radio_button_wrapper">
   <input id="marriage_1" name="marriage" type="radio" value="1">
   <label for="marriage_1"> 結婚していない</label><br>
   <input id="marriage_2" name="marriage" type="radio" value="2">
   <label for="marriage_2"> 結婚している</label>

<div class="radio_button_wrapper">
   <input id="gender_1" name="gender" type="radio" value="1">
   <label for="gender_1"> 男</label><br>
   <input id="gender_2" name="gender" type="radio" value="2">
   <label for="gender_2"> 女</label>

<button type="submit" class="submit_button">送信する</button>
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