View Full Version : Fluid Thinking

11-20-2002, 10:31 AM
I'm am about to present the definition of fluid thinking, followed by 2 simple exercises that are used to test fluid thinking. Fluid thinking supposedly peaks when people are in their late teens and 20s, and declines throughout adulthood.

If you want more of a challenge skip the following definition, though I don't think it will help much:

Definition 1: Fluid intelligence is flexible reasoning used to draw inferenceces and understand relations between concepts. It is made up of those basic mental abilities - inductive reasoning, abstract thinking, analysis. and the like - that are required for processing new ideas or facts about any subjecy.

Definition 2: Fluid intelligence: Those types of basic intelligence that make learning of all sorts quick and thorough. Underling abilities suck as short-term memory, abstract thought, and speed of thinking are usually considered part of fluid intellegence.

My friend (much older), who gave these to me could not get either one, which kinda makes sense since fluid thinking is supposed to peak in late teens or 20s. I got the first one rather quickly, though the second is much much harder I thought. You are supposed to get these within 2 min for testing, but I couldn't get the second one at all, infact it took me 1/2 an hour, after I knew what the right answer was from a key, to simply justify/prove the correct answer to the second one.

I won't say more about my solution for it, but i figure if any group of people would be the best fluid thinkers it would be programmers. Please say how you got the answer, especially on 2! heh I want to know if I pulled the answer outta thin air or if my method is right :confused:. (I do have the correct answers from key)

Good luck and don't spend too much time on this....Also you might not want to read the posts below this cause I'm sure people will get the answers and post them (duh!)

Problem 1:
Complete the next letter in the sequence:

B D A C Z B Y A ?

Problem 2 (hard one):
Complete the next number in the sequence:

4 5 6 3 4 5 2 3 4 5 6 ?

Answeres given away below!

11-20-2002, 10:43 AM
is #1 "x"?

and is #2 "7"

11-20-2002, 10:47 AM
You're right on 1.....

2 is wrong.

11-20-2002, 10:51 AM
It had better not be three. (stupid obvious repeating pattern if so)

11-20-2002, 10:52 AM
nope, feel free to put up your "algoritum" hehe.

11-20-2002, 10:52 AM
Why is 7 wrong?

11-20-2002, 10:56 AM
well, it starts out incrementing by 1 twice and then subtracting three. Then it breaks that pattern. Then I tried the obvious "just repeat the other #s trick".


I'll have to check this again tomorrow: class is about over.

11-20-2002, 11:07 AM
Well if I can't have 7, let's see...

4 5|6 3 4|5 2 3|4 5 6 ?

I go for 3 also. Apart from repeating, look at the first digit after the | symbol. They go:

6 5 4 ?

Therefore, the next is three. Also look at the middle numbers, they go

4 3 2 5

Also the last numbers

5 4 3 6

So the first set roll around at 3 to 6, the middle roll at 2 to 5, and the last roll at 3 to 6.

So it goes like

4 5|6 3 4|5 2 3|4 5 6| -> 345|634|523|456...

Edit. And I've just noticed it repeats.

11-20-2002, 11:20 AM
my guesses were the same as deathstryke. I don't see how it could be "wrong" anyway considering you're only looking for a pattern and we found one. :confused:

11-20-2002, 11:22 AM
I got number 1 easy enough, that is X!

Number 2............now that is a harder one, but I am also going to go with 3, simply because I am guessing that the pattern is a repeating pattern, and that 456 is where the loop starts again, and after that comes 3 !!!!

11-20-2002, 11:33 AM
I found another reason for number 2 to be 7

it deals with pairs adding up to 9

in each half, you have an inside out pairing

4 5 6 3 4 5 2 3 4 5 6 ?

4 5 2 ?
5 4 3 6
6 3 4 5

each pairing adds up to 9 so logically the question mark should be 7

11-20-2002, 11:47 AM
If this is fluid thinking, then the answer is there could be lots of answers. If there is a definate pattern and we determine that pattern dictates the next number is 7, then 7 is a correct answer.

Can't figure the word one though. Why is the answer X?

11-20-2002, 11:51 AM
There is a repeating pattern!
The first letter is B, the third one letter back in the alphabet( A ), the fifth another letter back ( Z ), seventh one more back ( Y ), so the ninth will be one more letter back, (ie. X)


11-20-2002, 12:23 PM
Yup I tried all those things, the 9, the adding, the subrtract, the flat out pattern, got the same answeres as you all, :)

It's wrong because that's not what they're looking for for fluid thinking I guess...we were thinking about writing the author, though we check 3 versions of the textbook and it's the same in them all.


The answer is 1. lol now try and justify it.

11-20-2002, 12:26 PM
Does it justify it in any of the books that contain the answer?

11-20-2002, 12:30 PM
:) It's a credible book lol. respected psychological textbook.

11-20-2002, 12:34 PM
if you're dealing with a "wrap-around" number system that makes sense...


456 345 234 561 //sorta

but it does seem that the last grouping should be 123 in that case

11-20-2002, 12:37 PM
but it's not, so that's not it. Tell me when you all give up hehe.

11-20-2002, 12:38 PM
I give up..:(

11-20-2002, 01:33 PM
The flaw of most pattern recognition tests is that they forget to remove (or consider) all other possible patterns. I see this sort of problem with many DIY IQ tests.

11-20-2002, 01:53 PM
SOLUTION: (only read if you've given up)

This is the solution I came up with:

The magic number is 6. When ever you have a 6 the counting restarts. There is no fancy plus minus etc math in it. The restart number (marked in green) is regressing by one each time:

4 5 6 | 3 4 5 | 2 3 4 5 6 | 1 |

Here's the catch. It doesn't just reset when there's a digit 6. Also once you've had 6 numbers (Whenever there's a 6 :)), I've marked those spots with red markers. Whenever there's a normal 6 I've marked in blue and it restarts.

Does this make sense? Does anyone else see a diffrent pattern?

11-20-2002, 01:57 PM
sorry, I think that's a stretch kermit:p

11-20-2002, 01:58 PM
Hey it works! Don't knock it hehe. Find a better pattren if you can ;).

11-20-2002, 01:59 PM
ya, but you had to throw in a "catch" to make it work. That's not very much of a pattern.

11-20-2002, 02:01 PM
There's no catch there. Whenever there's a 6 it restarts! And don't pick on my choice of words! :p

11-20-2002, 02:05 PM
I see an even better argument for 3 now

look at this

4 5 6 3 4 5 2 3 4 5 6 3
4 6 4 2 4 6
5 3 5 3 5 3

11-20-2002, 03:23 PM
the answer "1" would make sense if there were one more '6' in your pattern:


ive seen IQ books with misprints in them... its possible...

11-20-2002, 03:29 PM
I saw both those solutions, if there was the extra 6 and the 5 3 pattern. But we've checked 3 verisions of the book. It's possible it's a misprint but I doubt it.