a:1:{i:0;a:13:{s:2:"id";s:3:"638";s:7:"answer1";s:153:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=9%20%5Cchoose%204" alt="9 \choose 4" /></p>";s:7:"answer2";s:161:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=%5Cfrac%7B9!%7D%7B5!%7D" alt="\frac{9!}{5!}" /></p>";s:7:"answer3";s:161:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=%5Cfrac%7B9!%7D%7B4!%7D" alt="\frac{9!}{4!}" /></p>";s:7:"answer4";s:133:"<p><img class="latex" src="https://chart.googleapis.com/chart?cht=tx&amp;chf=a,s,000000|bg,s,FFFFFF00&amp;chl=9%5E4" alt="9^4" /></p>";s:7:"answer5";s:0:"";s:7:"answer6";s:0:"";s:7:"answer7";s:0:"";s:7:"answer8";s:0:"";s:7:"answer9";s:0:"";s:8:"answer10";s:0:"";s:4:"good";s:10:"0100000000";s:8:"question";s:4:"1898";}}