I have split the 26 letters of the alphabet into 4 sets. Here they are:

Set 1: $F G J L N P Q R S Z$
Set 2: $A M T U V W Y$
Set 3: $B C D E K$
Set 4: $H I O X$

Can you determine on what basis have I split them?

  • 3
    $\begingroup$ N, S, Z could form a set of their own. $\endgroup$
    – Florian F
    Jan 27, 2015 at 11:16
  • $\begingroup$ @FlorianF I was actually thinking the same, which caused me to hesitate about my answer, until I noticed what I was missing with those. But yeah, they should have had their own. $\endgroup$
    – Kevin
    Jan 27, 2015 at 11:17

1 Answer 1


My guess:

I think you have split them based on symmetry. The first group has no real symmetry, while the second group can be divided by drawing a line from top to bottom. The third group can be splitted by drawing a horizontal line from left to right, and the last group can be divided using either a vertical or horizontal line.

  • $\begingroup$ But N,S, and Z is symmetrical over a point in the middle. $\endgroup$
    – Taemyr
    Jan 29, 2015 at 14:39
  • $\begingroup$ @Taemyr I know - but they are not symmetrical by drawing a line either horizontally or vertically: Therefore I said that the first group has no real symmetry. $\endgroup$
    – Kevin
    Jan 29, 2015 at 14:42
  • 2
    $\begingroup$ @KevinVoorn What you mean to say is that they have no reflectional symmetry. $\endgroup$
    – Otaia
    Jan 29, 2015 at 16:11
  • $\begingroup$ @Otaia Exactly, English is not my native language :3 $\endgroup$
    – Kevin
    Jan 29, 2015 at 16:15

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.