確率の問題って難しいよね<br /><br />Part1 <a href="https://www.nicovideo.jp/watch/sm24354662" class="watch">sm24354662</a><br />Part3 <a href="https://www.nicovideo.jp/watch/sm24381293" class="watch">sm24381293</a><br />MyList <a href="https://www.nicovideo.jp/mylist/45507414" target="_blank" rel="noopener">mylist/45507414</a><br /><br />Part1まとめ <a href="https://www.nicovideo.jp/mylist/45482536" target="_blank" rel="noopener">mylist/45482536</a>