Interesting maths problem

in reality, all of this has been a total load of old bollocks
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Rorschach
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Re: Interesting maths problem

Postby Rorschach » 06 Jan 2022, 17:29

souphound wrote:We are working with base-10 numbers, yes?


Yes.
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Re: Interesting maths problem

Postby souphound » 06 Jan 2022, 17:31

I've got it. You have 230 dogs. 220 of them escape into the wild. Of the 10 left, half are halfwits. You're left with 5 good dogs and 5 headaches?
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Re: Interesting maths problem

Postby Rorschach » 06 Jan 2022, 17:41

souphound wrote:I've got it. You have 230 dogs. 220 of them escape into the wild. Of the 10 left, half are halfwits. You're left with 5 good dogs and 5 headaches?


Brilliant!












No.
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Hightea
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Re: Interesting maths problem

Postby Hightea » 06 Jan 2022, 17:50

No its not its 120

BIDMAS
no brackets - skip
no division - skip
multiplication - 220 * .5 = 110
none addition
subtraction 230 -110 = 120

explain how you are getting 5?
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Re: Interesting maths problem

Postby Positive Passion » 06 Jan 2022, 17:56

I expect the - is not a minus sign, but instead denotes a range or something - there is something like this in set theory - so range is 230 to 220 - which halved is 5.

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Re: Interesting maths problem

Postby Rorschach » 06 Jan 2022, 18:11

Hightea wrote:No its not its 120

BIDMAS
no brackets - skip
no division - skip
multiplication - 220 * .5 = 110
none addition
subtraction 230 -110 = 120

explain how you are getting 5?


I didn't say I was getting 5.

Read the first post very carefully.
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Re: Interesting maths problem

Postby Rorschach » 06 Jan 2022, 18:11

Positive Passion wrote:I expect the - is not a minus sign, but instead denotes a range or something - there is something like this in set theory - so range is 230 to 220 - which halved is 5.


It's a minus sign.
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Re: Interesting maths problem

Postby Positive Passion » 06 Jan 2022, 18:20

It had you confounded for 5 minutes?

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Re: Interesting maths problem

Postby Charlie O. » 06 Jan 2022, 18:23

Factorials.
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Re: Interesting maths problem

Postby Rorschach » 06 Jan 2022, 18:25

Positive Passion wrote:It had you confounded for 5 minutes?


Yes! And i was annoyed with myself for taking that long. It's actually very simple if you know the mathematical symbols, but I'm worried now that people don't know the relevant one.
It's come up in maths problems on here before and, as i said, Carlsson will spot it straight away, but if you don't know it, then it's impossible.

So it's a bit mean to post it in that case.

Do you want me to explain it?
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Re: Interesting maths problem

Postby Rorschach » 06 Jan 2022, 18:26

Charlie O. wrote:Factorials.


There you go!

It's 5!

Dis you spot it immediately, or did it puzzle you for a bit?
Last edited by Rorschach on 06 Jan 2022, 18:27, edited 1 time in total.
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Re: Interesting maths problem

Postby Positive Passion » 06 Jan 2022, 18:27

Rorschach wrote:
Positive Passion wrote:It had you confounded for 5 minutes?


Yes! And i was annoyed with myself for taking that long. It's actually very simple if you know the mathematical symbols, but I'm worried now that people don't know the relevant one.
It's come up in maths problems on here before and, as i said, Carlsson will spot it straight away, but if you don't know it, then it's impossible.

So it's a bit mean to post it in that case.

Do you want me to explain it?


Yes

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Re: Interesting maths problem

Postby Rorschach » 06 Jan 2022, 18:29

OK.

the symbol '!' in maths is known as 'factorial'. Any number followed by '!' is then multiplied by all integers between itself and one.
So 5! = 5 X 4 X 3 X 2 X 1, which equals 120.
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Re: Interesting maths problem

Postby Positive Passion » 06 Jan 2022, 18:34

Rorschach wrote:OK.

the symbol '!' in maths is known as 'factorial'. Any number followed by '!' is then multiplied by all integers between itself and one.
So 5! = 5 X 4 X 3 X 2 X 1, which equals 120.


Right.


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Re: Interesting maths problem

Postby Charlie O. » 06 Jan 2022, 18:36

Rorschach wrote:Did you spot it immediately, or did it puzzle you for a bit?

It did, until you said "Read the first post very carefully"...
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Re: Interesting maths problem

Postby Positive Passion » 06 Jan 2022, 18:42

A curmudgeon writes:

It would have been completely obvious if as well as getting the maths right, your English was up to scratch. If the ! Is a mathematical symbol, then the sentence should end with a full stop. I would have got it instantly then.

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Re: Interesting maths problem

Postby The Prof » 06 Jan 2022, 18:55

The actual calculation is 2 lines down from the exclamation mark - so the exclamation mark doesn't count

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Re: Interesting maths problem

Postby Rorschach » 06 Jan 2022, 19:01

Positive Passion wrote:A curmudgeon writes:

It would have been completely obvious if as well as getting the maths right, your English was up to scratch. If the ! Is a mathematical symbol, then the sentence should end with a full stop. I would have got it instantly then.


I didn't want to make it too easy for you.
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Re: Interesting maths problem

Postby Rorschach » 06 Jan 2022, 19:01

The Prof wrote:The actual calculation is 2 lines down from the exclamation mark - so the exclamation mark doesn't count


Eh?

I don't get it.
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Re: Interesting maths problem

Postby Positive Passion » 06 Jan 2022, 19:05

The Prof wrote:The actual calculation is 2 lines down from the exclamation mark - so the exclamation mark doesn't count


Mate, you have totally fallen into his trap. The answer is 5!. The exclamation mark is not part of the question, but part of the answer. He writes this in the last sentence of his post. It is a sort of joke.