Subsets of Letters

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Buttons
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Subsets of Letters

Postby Buttons » Fri Sep 14, 2007 3:52 pm UTC

Identify each of the following subsets of the alphabet. Parentheses surround letters whose place in the set may be disputed. For instance, if I said "EJMN(P)SUV," you would reply, "First initials of planets in the solar system." P would be in parentheses because reasonable people might argue about Pluto's place in this set. The elements of each set are given in alphabetical order. Sets are ordered approximately from easiest to hardest.

1: AEIOU(Y)
2: BCMNVXZ
3: BCDEGPTV(Z)
4: ABST
5: AHIMOTUVWXY
6: BCEGKMQSW
7: EGMPTYZ
8: CEFGHIJKLMNSTUVWXYZ
9: BCFHIKNOPSUVWY
10: CJMOR(S)V

Multiple answers probably exist, but all of the above can be summarized fairly succinctly.

Feel free to post answers (spoiler tagged) in this thread, and to add your own sets as well.

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Re: Subsets of Letters

Postby Cauchy » Fri Sep 14, 2007 4:42 pm UTC

I guess I'll clear out some of the these.

some answers wrote:1: AEIOU(Y) is "vowels." (Y is sometimes considered a consonant.)
2: BCMNVXZ is "letters on the bottom row of a QWERTY keyboard."
3: BCDEGPTV(Z) is "letters whose name rhymes with the word 'me.'" (Multiple pronunciations of Z exist; one of these rhymes.)
5: AHIMOTUVWXY is "letters whose capital version is symmetric about a vertical line."
9: BCFHIKNOPSUVWY is "letters which double as abbreviations for chemical elements."

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Postby gmalivuk » Fri Sep 14, 2007 4:43 pm UTC

1 wrote:Vowels, obviously.


2 wrote:The bottom row on a QWERTY keyboard. Which suggests that one or more of the others might relate to other keyboard layouts, but I'm not familiar with those and don't feel like looking them up at the moment.


11. ADEHINORST
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Postby MFHodge » Fri Sep 14, 2007 5:40 pm UTC

12. CDILMVX (Easy)
13. ADGJMPTW (Medium)
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Postby jtniehof » Fri Sep 14, 2007 5:52 pm UTC

answer to 12 wrote:Characters used as Roman numerals

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Postby Cauchy » Fri Sep 14, 2007 5:54 pm UTC

more answers wrote:6: BCEGKMQSW is "letters whose index in the sequence 'ABC...Z' is a prime number."
11. ADEHINORST is "letters which are one of the ten most frequent letters in the English language."
12. CDILMVX is "letters which are also Roman numerals."


14. CQRXY (Hard?)
15. AEILNORSTU (Medium)

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Postby Hix » Fri Sep 14, 2007 6:04 pm UTC

Answer to #8 wrote:Uppercase letters that enclose no area

Answer to #13 wrote:Letters that can be "texted" with a single press of a button (i.e. the first letter listed on a touch-tone telephone button)

Answer to #15 wrote:Scrabble Value 1

#16: GJPQY (Difficulty 4/10)
#17: CQRZ (5/10, inspired by #14)

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Postby Pesto » Fri Sep 14, 2007 8:04 pm UTC

#18: IOSXZ

#19: ABCDFGHIJKMOPQUVWXYZ

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Postby skeptical scientist » Fri Sep 14, 2007 11:11 pm UTC

20) ACDFGHIKLMNOPRSTUVW
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Postby Matthias » Sat Sep 15, 2007 12:51 am UTC

19 wrote:Letters you can choose from in the final round of Wheel of Fortune
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Re: Subsets of Letters

Postby quintopia » Tue Oct 09, 2007 9:07 am UTC

#21) BDEGHKLNPTUW (this list may be incomplete, but if it is, it would take me a long time to find out)

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Re: Subsets of Letters

Postby ptveite » Tue Oct 09, 2007 11:45 am UTC

22) BCDGIJLMNOPRSUVWZ

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Re: Subsets of Letters

Postby Nimz » Tue Oct 09, 2007 7:13 pm UTC

23) ABCDEFGHIJKLMNOPQRSTUVWXYZ (insanely easy)
It had to be done, and it technically fits all the requirements :lol:

24) ACDEFGHIJKLMPQRVWXYZ (slightly harder)

25) DHNOPQTU (medium)

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Lothar
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Re: Subsets of Letters

Postby Lothar » Tue Oct 09, 2007 8:02 pm UTC

26) BCDEFGIJKMNPQSUVWXYZ

related:

27) ABCDFGHIJKLMOPQRUXZ
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Re: Subsets of Letters

Postby MFHodge » Tue Oct 09, 2007 8:18 pm UTC

Lothar wrote:26) BCDEFGIJKMNPQSUVWXYZ

Spoiler:
The letters that are not used to spell "Lothar" (or "Harlot").


Lothar wrote:27) ABCDFGHIJKLMOPQRUXZ

Spoiler:
The letters that are not used to spell "Twenty Seven".
Image

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AdrianaC
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Re:

Postby AdrianaC » Sat Oct 27, 2007 11:21 pm UTC

Hix wrote: #16: GJPQY (Difficulty 4/10)


Spoiler:
Letters that, when in lowercase, extend below the usual writing line (sorry, don't know how else to word it)




skeptical scientist wrote:20) ACDFGHIKLMNOPRSTUVW


Spoiler:
First letters of the fifty states of the US

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Re: Re:

Postby PaulT » Sun Oct 28, 2007 12:15 am UTC

AdrianaC wrote:
Hix wrote: #16: GJPQY (Difficulty 4/10)


Spoiler:
Letters that, when in lowercase, extend below the usual writing line (sorry, don't know how else to word it)


Spoiler:
I think the technical term for those things is 'descenders'.


Here, I'll do one:

28: CJMORV

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AdrianaC
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Re: Re:

Postby AdrianaC » Sun Oct 28, 2007 12:22 am UTC

PaulT wrote:Here, I'll do one:

28: CJMORV




Buttons wrote:10: CJMOR(S)V

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Re: Subsets of Letters

Postby PaulT » Sun Oct 28, 2007 12:35 am UTC

Oh. I looked through them all as well to check. Darn.

Edit: on the plus side, nobody seems to have posted a solution to 10, so I guess that means I've inadvertently solved it. So:

10 (and by extenstion 28):

Spoiler:
letters that are represented by people's names in the phonetic alphabet

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Re: Subsets of Letters

Postby quintopia » Sun Oct 28, 2007 9:29 pm UTC

29: (A)EGKLMPXZ

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Geekthras
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Re: Subsets of Letters

Postby Geekthras » Sun Oct 28, 2007 9:42 pm UTC

30. NXDARO

(In no order)
Wait. With a SPOON?!

Sum Ergo Sum
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Re: Subsets of Letters

Postby Sum Ergo Sum » Tue Oct 30, 2007 3:46 am UTC

ptveite wrote:22) BCDGIJLMNOPRSUVWZ


Spoiler:
Letters that can be written without lifting your pencil off the paper or retracing any lines


pesto wrote:#18: IOSXZ


Spoiler:
All have rotational symmetry.


31. CD(H)JKLM(N)QZ

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Re: Subsets of Letters

Postby quintopia » Tue Oct 30, 2007 3:59 am UTC

32. GPSVXZ(C)

^This one's way hard.


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