JAVA SCRİPT İLE İLGİLİ BİR SORUM VAR

 <div class="col-md-4">
              <p>Which is faster?</p><br><br>
              <ul>
                <li><input class="sorular" type="radio" name="faster" value="dogru"> Airplane</li>
                <li><input class="sorular" type="radio" name="faster" value="yanlis"> Car</li>
                <li><input class="sorular" type="radio" name="faster" value="yanlis"> Cheetah</li>
                <li><input class="sorular" type="radio" name="faster" value="yanlis"> Bicycle</li>
              </ul>
          </div>

          <div class="col-md-4">
              <p>Which is slower?</p><br><br>
              <ul>
                <li><input class="sorular" type="radio" name="slower" value="dogru"> Turtle</li>
                <li><input class="sorular" type="radio" name="slower" value="yanlis"> Tiger</li>
                <li><input class="sorular" type="radio" name="slower" value="yanlis"> Cat</li>
                <li><input class="sorular" type="radio" name="slower" value="yanlis"> Horse</li>
              </ul>
          </div>

<button onclick =" return !! ( checked () & check ())" id="kont" type="button" class="btn btn-default">check</button>