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Anonymous No. 16262091

I encountered this sequence in an IQ test and I couldn't solve it. Can /sci/?

1, 20, 20, 5, 6, 90, ?

Anonymous No. 16262098

>>16262091
90
clearly any time a number is divisible by ten it appears twice in a row as seen by 20, 20

Anonymous No. 16262099

>>16262098
Yeah, but how do you jump from 1 to 20 and then back to 5?

Anonymous No. 16262103

90, 18, 25

Anonymous No. 16262105

>>16262099
If an entry is prime, add 1 and multiply by 10
After two consecutive identical entries, add all the digits of those two entries then add 1
so after 90, 90 will be 19

Anonymous No. 16262106

>>16262091
11teen

Anonymous No. 16262124

>>16262105
Math autist, have a (You).
how do you know it's add 1, not add third previous number?

Anonymous No. 16262127

>>16262091
There are a couple things I see.
92
180
I will think about it more.
Was this surrounded by easy problems or difficult ones?

Anonymous No. 16262135

>>16262124
It could be either, I just made up some rules that work, yours works just as well

Anonymous No. 16262182

>>16262105
This doesn't explain how it goes from 1 to 20.

Anonymous No. 16262189

>>16262091
you can fit an infinite number of sequence to this. midwits will try to give you a reason for their choosen numbers but math chad will tell you any number is valid.

Anonymous No. 16262192

>>16262189
Math chad would also be able to prove such a statement.

Anonymous No. 16262199

>>16262182
Yes it does read it again

Anonymous No. 16262213

>>16262192
it's pathetically easy for anyone with high school level mathematics. you can literally just fit a high enough degree polynomial to the sequence and get infinite numbers of solutions. don't ask me to expand further on this basic shit. I don't want to wrestle with sub-120 IQ dimwits on an anonymous forums.

Anonymous No. 16262217

I could come up with multiple valid terms and justify them easily. The "answer" is not really the point of these questions, but rather your ability to recognize some reasonable pattern very quickly. There will usually be a number of valid answers when these sorts of questions are assessed.

Anonymous No. 16262229

>>16262213
If your approach gives you more than a single solution to an IQ test question, why do you think your approach is correct? What makes one solution more valid than the other?

Anonymous No. 16262279

>>16262105
Doesn’t work because we should have 60, not 6

Anonymous No. 16262284

>>16262279
Okay but the added stipulation if the prime is preceded by something divisible by 10 then you instead add one tenth the previous term then subtract 1

Anonymous No. 16262296

>>16262091
>1, 20, 20, 5, 6, 90,
Count the number of holes
>0, 1, 1, 0, 1, 2
This follows the sequence of
>0, 1, 1, 0, 1, 2, 0, 1, 3, ...
So the next number has zero holes. This reduces it to a single digit number. Since the single digit numbers are increasing, the only single digit number greater than 6 with no holes is 7. The answer is 7. Followed by 8 and then by 600.

Anonymous No. 16262359

>>16262199
1 is not prime retard

Anonymous No. 16262393

>>16262091
the next number is 2. its just counting with 5 random numbers in between

Anonymous No. 16262477

>>16262091
Was this a multiple choice what were the options

Anonymous No. 16262478

>>16262213
Sure, you can come up with something like
[math]\displaystyle \frac{9x^5 + 45x^4 - 415x^3 - 345x^2 + 2986x + 120}{120}[/math]
but you can instantly dismiss that as a solution because you need all 6 points to come up with this polynomial. On the other hand, if you used 5 points to find a 4th degree polynomial, tested on the 6th point, and found that it worked (of course, in this case it will not), that would be interesting.

Anonymous No. 16262495

Another example of a garbage solution would be
[math]\displaystyle a_n = \frac{33330 a_{n-1} - 33086 a_{n-2} + 26645 a_{n-3}}{6305}[/math]
which would give [math]\displaystyle \frac{2934409}{6305}[/math] as the next number. It's garbage because it required all 6 numbers to calculate it, and there was no number left to confirm the pattern.

Anonymous No. 16262548

you guys are just as stupid as I am, and i'll have you know i'm pretty stupid.

Anonymous No. 16262699

>>16262548
You're clearly remembering the question wrong, you need to provide a screenshot or photo of the actual question

Anonymous No. 16262774

>>16262296
I like this, but then why didn't it start with 1, 20, 30?

Anonymous No. 16262846

OP here. With the test results they sent me the right answers. Right answer for this question was 3. I got it wrong and scored only 112 on the IQ test. Guess I won't get that job.

Anonymous No. 16262898

The favorite IQ test trick is:
Ordered increases
3, 6, 9, 12, 15.

Next trick is interleaved sets.
3, 10, 6, 8, 9, 6, 12, 4...
First set is 3, 6, 9, 12...
Second set is 10, 8, 6, 4...

Usually they use a simple formula for set progression.
The interleaved set above is X=3; X=X+3 for the first set, and Y=10; Y=Y-2.

Your sets might be multiplication or division, but IQ tests usually favor integer numbers.
The harder questions of this format might also be the style of X=(X*2)+3. So if X=2 at the beginning, it would progress as 2, 7, 17, 37...
2, (2*2)+3=7, (7*2)+3=17, (17*2)+3=37, and so on... but practically speaking the next value prediction would be 74+3=77.

If you keep this knowledge in mind, most IQ number series questions are easy.

Anonymous No. 16262965

>>16262846
Was there an explanation of the answer? If not, how do you know they're not making up an answer after the fact to hire whatever candidate they want?

Anonymous No. 16263229

>>16262898
Just another trick, not IQ.
The answer to your "interleaved" problem appears to be -385, but that is just a trick.
There is another true answer.

Anonymous No. 16263844

>>16262091
>single IQ test question in vacuum
Not how IQ tests work.

Anonymous No. 16263846

>>16262898
If you study IQ tests then you are incapable of taking IQ tests accurately.

This should be taken as a given, but it's actually stunning how many people don't understand this. They just want a "high IQ" badge and don't realize they've thwarted any chance of demonstrating actual intelligence.

Anonymous No. 16263869

>>16262965
I'm pretty sure it would be illegal for a company to do that.

Anonymous No. 16263873

>>16263869
It's only illegal if you get caught.

Anonymous No. 16263897

>>16262091
1+1=2, 2-2=0,, 4+1=5, 5+1=6, 6+4-1=90, 90+4=12...ez mode bby

Anonymous No. 16263920

>>16262091
a) wtf does it mean to 'solve a sequence'?
b) if you mean 'figure out the next number' then any number is correct, you just fit a polynomial to the sequence plus your chosen number and claim that that is the solution.

Anonymous No. 16263922

>>16263920
gay and pedantic answer
sniff glue

Anonymous No. 16263924

>>16263920
Reddit answer

Anonymous No. 16263940

>>16263922
>>16263924
facebook tier posts go to facebook. this is /sci/.

Anonymous No. 16263994

>>16262091
90
1x20 =20
20/4 = 5
So we get 1, 20, 20, 5
Next they started a new progression with 6.
This time 6 is multiplied by 15
6x15 = 90
By proportion [20:4::15:3], 90 should be divided by 3
90/3 = 30
So here's the continued series
1,20,20,5::6,90,90,30

Anonymous No. 16263997

>>16262478
>>16262495
Those aren't garbage solutions. You have no idea what the next point is, simply because the algorithm doesn't extrapolate well is literally meaningless.

You also WON'T find an algorithm that fits well while leaving the last data point out, 90 is an extreme data point, I.e., a leverage point and will fall out of almost anything you fit to the data if you aren't containing it as an interpolation point.

Anonymous No. 16264009

>>16263940
/sci/ is full of facebook-tier conspiracies and retards

Anonymous No. 16264072

>>16262091
yes
(the actual answer is considered trivial and left as an exercise to the reader)

Anonymous No. 16264092

>>16262091
I'm a simple /pol/ man with a mediocre intellect.
My heuristic tells me that OP is fake & gay. He's lying about that sequence being on a test and just wants to make /sci/ feel insecure.
I notice I'm the only one mentioning this possibility, which means that everyone else here, except possibly OP, is even dumber than I am, no matter how many convoluted solutions they can produce.

Anonymous No. 16264289

>>16264009
Is all the fault of climate cultists, vaxxers and glowing flat earthers. And now there is a kike spamming porn.

Anonymous No. 16264320

>>16264289
while they ban anyone who says the N word within precisely 5 nanoseconds.

Anonymous No. 16264385

>>16262091
In these types of questions I basically sit stuck at a superposition. There are multiple solutions the test maker could have wanted. I have to figure out what they wanted, not necessarily what most logically follows.