Difficult!

in reality, all of this has been a total load of old bollocks
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Robert
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Difficult!

Postby Robert » 29 Jun 2021, 12:58

In an assesment the following sequence was given with the task to replace the question mark by a figure to complete the sequence in the most logical way:

2…….6………?………30………-270


Anybody?

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GoogaMooga
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Re: Difficult!

Postby GoogaMooga » 29 Jun 2021, 14:15

minus 270 at the end?
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Rorschach
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Re: Difficult!

Postby Rorschach » 29 Jun 2021, 16:17

Fucked if I know.

I have tried but I'm getting nothing.
Bugger off.

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souphound
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Re: Difficult!

Postby souphound » 29 Jun 2021, 16:21

π?

-π?

No clue. :oops:
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Re: Difficult!

Postby kath » 29 Jun 2021, 20:59

Robert wrote:In an assesment the following sequence was given with the task to replace the question mark by a figure to complete the sequence in the most logical way:

2…….6………?………30………-270


Anybody?


welll, i was fine at first, thinking *double it and add 2*... which got me to 14 for the question mark... fine at 30...

and then my brain exploded.

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never/ever
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Re: Difficult!

Postby never/ever » 29 Jun 2021, 23:28

-270 would only make sense if it would have something to do with Kelvin....
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Re: Difficult!

Postby toomanyhatz » 30 Jun 2021, 01:02

I'm thinking the missing number might be a negative number - multiply a negative number by a positive number and the result is negative, multiply a negative number by a negative number and the result is positive, so whether the equation is positive or negative might be alternating - but I can't detect a pattern of numbers that would make that make sense.

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Rorschach
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Re: Difficult!

Postby Rorschach » 30 Jun 2021, 08:14

kath wrote:
Robert wrote:In an assesment the following sequence was given with the task to replace the question mark by a figure to complete the sequence in the most logical way:

2…….6………?………30………-270


Anybody?


welll, i was fine at first, thinking *double it and add 2*... which got me to 14 for the question mark... fine at 30...

and then my brain exploded.



Maybe it's 'double it an add two until you get to the last one and then it's multiply by minus 9'

Sorted.

By the way, Robert, is it a purely mathematical sequence?
Bugger off.

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C
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Re: Difficult!

Postby C » 30 Jun 2021, 10:12

Robert wrote: task to replace the question mark by a figure to complete the sequence in the most logical way?


I think there is a clue in the question 'the most logical way' rather say 'solve' or 'work out' the missing value in this sequence. To me that suggests it is not necessarily a unique solution and perhaps open to some form of interpretation.

It's not an arithmetic progression with a common difference like multiply by x and add y

Neither is it a geometric progression with a common ratio eg multiply by z.

Which is fine - other sequences clearly exist like 1, 1, 2, 3, 5, 8, 13...

But, Tym's question as to whether it is 'purely mathematical sequence' is a good one

It reminds me of this sequence which I saw recently:

1, 2, 5, 10, 20, 50... What are the next two terms?





















Well, it's not a proper mathematical sequence. The figures represent British money/coinage

1p, 2p, 5p... so the answer is either 1 and 2 (pounds) or 100 and 200.

So, I demand some clarification from Robert before lunging in to the question.

Please






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Lord Rother
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Re: Difficult!

Postby Lord Rother » 30 Jun 2021, 10:48

I've had a play, and whilst I'm absolutely sure it's not right, it IS a (fairly) logical solution.....!!

These are the factors of -270

-1 x 270 = -270
-2 x 135 = -270
-3 x 90 = -270
-5 x 54 = -270
-6 x 45 = -270
-9 x 30 = -270
-10 x 27 = -270
-15 x 18 = -270
-18 x 15 = -270
-27 x 10 = -270
-30 x 9 = -270
-45 x 6 = -270
-54 x 5 = -270
-90 x 3 = -270
-135 x 2 = -270
-270 x 1 = -270

Red highlights are the numbers in the sequence, continuing the sequence would mean that the missing number is 15.

Also, the numbers being 2, 6, 15 and 30 are (respectively) 135, 45, 18 and 9 as factors of -270.

135 / 3 = 45.
45 / 2.5 = 18.
18 / 2 = 9.
9 / 1.5 = 6.

I don't know what I'm saying now so I'll stop.

Bit of fun anyway!

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Re: Difficult!

Postby The Prof » 30 Jun 2021, 11:13

I think there's a simpler solution.

It's Matt Hancock's body heat in the moments before he saw the CCTV footage.

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Rorschach
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Re: Difficult!

Postby Rorschach » 30 Jun 2021, 12:12

:lol:
Bugger off.

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Robert
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Re: Difficult!

Postby Robert » 30 Jun 2021, 15:28

C wrote:
Robert wrote: task to replace the question mark by a figure to complete the sequence in the most logical way?


I think there is a clue in the question 'the most logical way' rather say 'solve' or 'work out' the missing value in this sequence. To me that suggests it is not necessarily a unique solution and perhaps open to some form of interpretation.

It's not an arithmetic progression with a common difference like multiply by x and add y

Neither is it a geometric progression with a common ratio eg multiply by z.

Which is fine - other sequences clearly exist like 1, 1, 2, 3, 5, 8, 13...

But, Tym's question as to whether it is 'purely mathematical sequence' is a good one

It reminds me of this sequence which I saw recently:

1, 2, 5, 10, 20, 50... What are the next two terms?





















Well, it's not a proper mathematical sequence. The figures represent British money/coinage

1p, 2p, 5p... so the answer is either 1 and 2 (pounds) or 100 and 200.

So, I demand some clarification from Robert before lunging in to the question.

Please






:D


I don’t know anymore than you do! They say it is a sequence which would suggest there’s rationality at the core of it. However they do not expressly say it’s a mathematical sequence.

It could be something similar to the Kelvin suggestion above.

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Robert
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Re: Difficult!

Postby Robert » 30 Jun 2021, 15:29

Lord Rother wrote:I've had a play, and whilst I'm absolutely sure it's not right, it IS a (fairly) logical solution.....!!

These are the factors of -270

-1 x 270 = -270
-2 x 135 = -270
-3 x 90 = -270
-5 x 54 = -270
-6 x 45 = -270
-9 x 30 = -270
-10 x 27 = -270
-15 x 18 = -270
-18 x 15 = -270
-27 x 10 = -270
-30 x 9 = -270
-45 x 6 = -270
-54 x 5 = -270
-90 x 3 = -270
-135 x 2 = -270
-270 x 1 = -270

Red highlights are the numbers in the sequence, continuing the sequence would mean that the missing number is 15.

Also, the numbers being 2, 6, 15 and 30 are (respectively) 135, 45, 18 and 9 as factors of -270.

135 / 3 = 45.
45 / 2.5 = 18.
18 / 2 = 9.
9 / 1.5 = 6.

I don't know what I'm saying now so I'll stop.

Bit of fun anyway!


I think you maybe on to something! Although you lost me from ‘ also, the numbers……’

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Rorschach
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Re: Difficult!

Postby Rorschach » 30 Jun 2021, 15:47

You bastard! You mean you don't know the answer!!??

And we may never find out!!!!!!?????

:evil: :evil: :evil: :evil: :evil: :evil: :evil: :evil:
Bugger off.

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Re: Difficult!

Postby Lord Rother » 30 Jun 2021, 16:29

Robert wrote:
Lord Rother wrote:I've had a play, and whilst I'm absolutely sure it's not right, it IS a (fairly) logical solution.....!!

These are the factors of -270

-1 x 270 = -270
-2 x 135 = -270
-3 x 90 = -270
-5 x 54 = -270
-6 x 45 = -270
-9 x 30 = -270
-10 x 27 = -270
-15 x 18 = -270
-18 x 15 = -270
-27 x 10 = -270
-30 x 9 = -270
-45 x 6 = -270
-54 x 5 = -270
-90 x 3 = -270
-135 x 2 = -270
-270 x 1 = -270

Red highlights are the numbers in the sequence, continuing the sequence would mean that the missing number is 15.

Also, the numbers being 2, 6, 15 and 30 are (respectively) 135, 45, 18 and 9 as factors of -270.

270/2 = 135... 135 / 3 = 45.
270/6 = 45... 45 / 2.5 = 18.
270/15 = 18... 18 / 2 = 9.
270/30 = 9... 9 / 1.5 = 6.

Just illustrating there is another pattern there, 3 to 2.5 to 2 to 1.5 which all stands to reason I suppose.


I don't know what I'm saying now so I'll stop.

Bit of fun anyway!


I think you maybe on to something! Although you lost me from ‘ also, the numbers……’


edited in Red....

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Re: Difficult!

Postby Your Friendly Neighbourhood Postman » 30 Jun 2021, 17:07

Rorschach wrote:You bastard! You mean you don't know the answer!!??

And we may never find out!!!!!!?????

:evil: :evil: :evil: :evil: :evil: :evil: :evil: :evil:


:D :D :D

...is what I thought. It may well be a cunning teaser without any credible rational solution at all.

We could debate this one for as long BCB exist, and since it is with us for 18 years by now, many a willing board member could find her- or himself being transported to an instution for mental disorders in the future. And DSM-VI will have a new diagnostic category.

There is another possibility. Suppose that the riddle, thought up by Robert without thinking anything, does have a rational and surprising solution.

And some quietly brilliant BCB'er will come up with it...
On the whole, I'd rather be in Wallenpaupack.

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Robert
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Re: Difficult!

Postby Robert » 01 Jul 2021, 09:58

It is not thought up but a real question in an assesment that graduates applying for a job are expected to be capable of doing.

It’s not a trick question. In this case it was not an assesment for mathematician but for a lawyer.

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Re: Difficult!

Postby Your Friendly Neighbourhood Postman » 01 Jul 2021, 11:07

Robert wrote:It is not thought up but a real question in an assesment that graduates applying for a job are expected to be capable of doing.

It’s not a trick question. In this case it was not an assesment for mathematician but for a lawyer.


Thanks (and I mean it).
On the whole, I'd rather be in Wallenpaupack.

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Re: Difficult!

Postby Positive Passion » 01 Jul 2021, 12:58

232