1. <b>What are</b> the chances of finding intelligent aliens?<br/>2. <b>What are</b> the odds of that?<br/><br/>3. <b>How high are</b> the chances of finding intelligent aliens?<br/>4. <b>How high are</b> the odds of that?<br/><br/>I'd like to know why #1 and #2 are used, not #3 and #4.<br/>Thank you in advance for your help.