Hi,<br/><br/><br/><br/>Sentence #1 here is from a book. Sentence #2 is my version. Which one is better and why?<br/><br/>Also why did author omit an article before ‘increased probability”?<br/><br/><br/><ol><br/><li>1. The costs of biking without a helmet include increased probability of personal injury or death.</li><br/><li>2. The costs of biking without a helmet include <u><b>an</b></u> increased probability of personal injury or death.</li></ol><br/><br/>Thanks,<br/><br/><br/><br/>MG.