ecn-ec:ecn-pc:ecn-ed:vu@pur-ee.UUCP (09/22/83)
OK, now I know why I was wrong. In fact, I figured out that my mistake was the same as that someone who got 1/2 when solving the drawer-gold coins problem (remember it ?): I counted the case "happening for both" twice [ those getting 1/2 in the above problem made the inverse mistake: they counted gold-gold once while they're supposed to count it twice] Anyway, now I know why I was wrong, thanks to all your replies. SinSI canI can't reply to all of you since there are too m~any replie|s.| |@@@@@ But believe that I am very grateful. Hao-Nhien Vu (pur-ee!norris) Again, thanks.