The 26 letters of the alphabet were divided into two piles according to a simple rule. Two letters were then swapped leaving the piles as follows.

Pile 1: a,c,e,g,j,o,q,s,u,v,w,y,z
Pile 2: b,d,f,h,i,k,l,m,n,p,r,t,x

Which two letters should be swapped to return each pile to its original composition?

(In reply to re: Just a guess by Vernon Lewis)

Just a guess = my logic was not satisfactory.

Alphabetically the letters are in piles:

12121212212222121212111211

breaking into patterns

12121212 21 2222 12121211 1211

change x and v

12121212 21 2222 12121212 1111

Essentially it looked neater (sans the "i" and "j") and I decided (logic aside) to throw a guess into the mess.

Posted by Leming on 2007-01-19 14:10:54