Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,812

**What is the next letter in this sequence?**

**A B H F M C I G T D O J U ?**

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**jU****Real Member**- Registered: 2005-08-17
- Posts: 1,923

Offline

**krassi_holmz****Real Member**- Registered: 2005-12-02
- Posts: 1,905

K?

IPBLE: Increasing Performance By Lowering Expectations.

Offline

**jU****Real Member**- Registered: 2005-08-17
- Posts: 1,923

read my post

Offline

**rimi****Member**- Registered: 2006-02-21
- Posts: 17

E?

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,812

Well done, rimi! It is E. You get an award for this.

Can you tell the reason why the next letter in the sequence is E?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**jU****Real Member**- Registered: 2005-08-17
- Posts: 1,923

I have the answer it is $E

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,812

rimi, jU,

Please justify your answer.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ashwil****Member**- Registered: 2006-02-27
- Posts: 121

Looks like it was a lucky guess prompted by the apparent relative positioning of B, C, D! What about it, guys?

Offline

**Patrick****Real Member**- Registered: 2006-02-24
- Posts: 1,005

I have to admit I don't get the sequence

Support MathsIsFun.com by clicking on the banners.

What music do I listen to? Clicky click

Offline

**ashwil****Member**- Registered: 2006-02-27
- Posts: 121

The letter after E would be X

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,812

Excellent, ashwil!

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**ashwil****Member**- Registered: 2006-02-27
- Posts: 121

Alas, it is more a tribute to memory than to puzzle-solving ability. I just had a flash of inspiration and remembered my maths teacher from 1978 who had a fascination for this kind of puzzle. He had set us a very similar teaser that took us weeks to crack (and with more than one or two clues!).

Is it time to give a clue on this one? I must say, the logic is one of the more obcure relationships.

Offline

**Patrick****Real Member**- Registered: 2006-02-24
- Posts: 1,005

I'd like a clue

Support MathsIsFun.com by clicking on the banners.

What music do I listen to? Clicky click

Offline

**ashwil****Member**- Registered: 2006-02-27
- Posts: 121

A clue of sorts:

In solving letter sequences, there are usually 3 basic questions to ask:

1. Is there a mathematical progression? (eg, move 4 letters through the alphabet, then back two etc)

2. Is there a sequence based on initial letters of something occurring in general life, not mathematics? (MTWTFSS, OTTFFSS, JFMAMJJ)

3. Is there an intrinsic quality to the letters themselves that has nothing to do with the above?

Offline

**Patrick****Real Member**- Registered: 2006-02-24
- Posts: 1,005

not sure I understand the 2. 'question'..

Support MathsIsFun.com by clicking on the banners.

What music do I listen to? Clicky click

Offline

**ashwil****Member**- Registered: 2006-02-27
- Posts: 121

OK, the first of the examples refers to Monday, Tuesday, Wednesday etc. I.e., these examples are not mathematical, but rely on lateral thought to make a conection with a sequence that is "familiar" in its normally occurring form. These 3 examples are the ones you would see most often, but sometimes you may get something really obscure like HHLBBC... (the periodic table of the elements: Hydrogen, Helium etc)

I suggest you focus on the 3rd category!

Offline

**Patrick****Real Member**- Registered: 2006-02-24
- Posts: 1,005

I get it now .. Thx

Support MathsIsFun.com by clicking on the banners.

What music do I listen to? Clicky click

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,812

**Another sequnce, this time a simpler one! **

**Where should the number 10 be placed to continue the sequence?**

**8 5 4 9 1 7 6 3 2 **

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

. ^

Why did the vector cross the road?

It wanted to be normal.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,812

**mathsyperson is correct, can someone other than him tell why 10 should be placed there?**

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

Pages: **1**