><i>If there are a number of potential girlfriends, using the letter ‘n’ to represent the number, then he should reject the first n divided by ‘e’ (e is a key number in mathematics and has a value of about 2.72). He should then accept the next girlfriend after that who is better than all the preceding ones. If none of them are better than all the earlier ones then he ends up with the last girlfriend.</i><p>This doesn't explain why this formula should be used. It explains how to apply the formula given the figures.<p>Surely the "better" part is the most complicated part to analyse. Also, to what end, you shouldn’t marry before you're 27 to ... what? Have the longest marriage, be most fulfilled, parent the best children, make the most money?<p>The assumption of availability makes the whole thing pointless IMO.