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BigRedRod
13th of November, 2002, 21:39
Our tutor gave us this in the tue and it's driving me insane

you have 4 numbers
1 3 4 6
you have to use only
multiplication
division
additon
subtraction

and all the numbers

and get 24

Someone do it for me, so that I can die happy

itches
13th of November, 2002, 21:45
Do you have to use
multiplication
division
additon
subtraction

As in have to use all of them?

and each number only once right??


first thing for problems like that. Look for loop holes. :)

BigRedRod
13th of November, 2002, 21:50
no you just can use
multiplication
division
additon
subtraction


but you have to use each number once

it woudl be easy if you could use them multiple times, or not at all :)

itches
13th of November, 2002, 21:52
Next question, can i arrange them to form new numbers?

as in putting 1 and 3 next to each other to get 13

BigRedRod
13th of November, 2002, 21:54
no
no you can't


and i'm told there is only a single solution

LeeCHeSSS
14th of November, 2002, 02:44
(6-4+3)^2-1
5^2-1
25-1
24

BigRedRod
14th of November, 2002, 03:16
nope that uses a 2

LeeCHeSSS
14th of November, 2002, 04:22
It doesn't, it's merely a way to write down the multiplication...

Maeko
14th of November, 2002, 04:24
Ah, you mean 'five to the second power'...

BigRedRod
14th of November, 2002, 05:10
ack
yeah it either uses a 2
or a number twice

there are two ways to write it
but still you are wrong :)

LeeCHeSSS
14th of November, 2002, 06:44
I don't care what you say, I feel smart for at least coming up with a way :)

The_Friendly_Fiend
14th of November, 2002, 09:49
What were the extact instructions? Did them mention anything about prime numbers? If you don't have to use primes, the answer becomes 6*4=24 since 1 and 3 are primes.

BigRedRod
14th of November, 2002, 17:27
I don't see why you are dismissing the primes, we have to use all four numbers
There was no mention of a special case for primes


I don't care what you say, I feel smart for at least coming up with a way
but it's not the right way :)

itches
14th of November, 2002, 17:45
I'm taking leechesss stance.

i worked out how to get it to Zero. So i feel smart for that.

BigRedRod
15th of November, 2002, 03:58
solved it

3*6 = 18
+1 = 19
+5 = 24

no tricks involved

Gralhruk
15th of November, 2002, 04:11
That's good except where'd you get the "5" from?

The numbers in the problem are 1346.

BigRedRod
15th of November, 2002, 04:28
hmmm
I don't know :)
I don't even know if the original number was a 4 or 5

I'll get back you next wednesday on whether it should have been a five or a four :)

The_Friendly_Fiend
15th of November, 2002, 11:51
Let me guess, your three was the key to solving the problem since "Three is a magic number!" :P

"Hey Rocky, watch me pull a five out of my hat. Presto! Whoa! I better get me a new hat."

Skreem
15th of November, 2002, 12:11
well... TECHNICALLY, using rounding, 6*4+1/3=24

as 1/3 = .333333 which is less than .5

Ok, so it's a bit cheesy, but is technically correct. Otherwise, I can get almost any number BUT 24 :)

LeeCHeSSS
15th of November, 2002, 19:05
Technically correct my ass... Rounding numbers to integers isn't default practice. Otherwise I'd fill my car's fuel tank by dripping the fuel into it: How much does one drop of fuel cost?

Skreem
16th of November, 2002, 06:59
LeeCheSSS - Actually, there IS rounding happening at the gas tank, it's just to the nearest 1/1000th (at least, here in the states it is), and to the nearest penny.

Rounding happens everywhere - there are just generally accepted digits that rounding happens at.

For instance, State Sales tax in California is 8.25% - This doesn't make for "whole penny" numbers - which means that rounding must happen. This is part of what Arthur Anderson is in big trouble over - each of those fractions of cents were being diverted to various accounts. When dealing with millions of transactions a day, 1/10th of a penny adds up VERY quickly!

itches
20th of November, 2002, 18:35
Any word yet weither it was meant to be a 4 or a 5?

LeeCHeSSS
20th of November, 2002, 20:06
Originally posted by LeeCHeSSS
Rounding numbers to integers isn't default practice.Main Entry: in·te·ger
Pronunciation: 'in-ti-j&r
Function: noun
Etymology: Latin, adjective, whole, entire -- more at ENTIRE
Date: 1571
1 : any of the natural numbers, the negatives of these numbers, or zero
2 : a complete entity

Skreem; while your reply does contain valid arguments, it does not relate to what I said :)

BigRedRod
20th of November, 2002, 21:04
nope
tutorial conacelled

have to wait till next wednesday
or i could always email him i suppose, i doubt he has much better to do

itches
20th of November, 2002, 21:51
e-mail away :)

SponkleofInfini
20th of November, 2002, 22:33
look what you have done to us BRR.............we are hanging on for the damn answer :)

itches
20th of November, 2002, 23:49
Oh yes, and if BRR comes back telling us it was ment to be a 5, not a 4. There will be some trouble.

And maybe some Napalm. Everyone likes Napalm :)

BigRedRod
21st of November, 2002, 04:20
yep
hanging
bewcuase your myt puppets
it's the formal tonight, so i'll mail him tomorrow maybe ( i have a big frikkin gap in the middle of my day, so i'll sit in the labs and send one out while pretending to be doing Maple)

Skreem
21st of November, 2002, 06:38
round1
(click to hear the word) (round)
adj. round·er, round·est
<snip>
Mathematics Expressed or designated as a whole number or integer; not fractional.
<snip>

(provided by www.yourdictionary.com)


I dunno, seems to work for me :)

The_Friendly_Fiend
21st of November, 2002, 10:49
You know he's going to leave us hanging. Builds up the excitement and then poof, nothing. Anyone got a stick handy? We could just beat the answer out of him.

PaVel
21st of November, 2002, 11:34
6 / (1 - (3 / 4)) this should do it

SponkleofInfini
21st of November, 2002, 16:05
Well what do you know, he has done it :)

BigRedRod
21st of November, 2002, 17:27
good stuff
we've done it with both sets of numbers
looking back the set I posted here seem most likely
it would explain why it wasn't as obvious

LeeCHeSSS
21st of November, 2002, 21:54
Bah, never was used to dividing by fractions...

PaVel
21st of November, 2002, 23:34
use only 3 4 7 & 8

result 10
Same rules apply

SponkleofInfini
22nd of November, 2002, 07:42
Arghhhh not another one, and just when I thought this site was about role-playing games :)

The_Friendly_Fiend
22nd of November, 2002, 12:40
Think of it this way, you're getting puzzle work. Torment your players with these problems. Then again, they might just take you out back and shoot you if you give them too many of these things.

SponkleofInfini
22nd of November, 2002, 13:08
If you expect them t be solved I would advise against using such problems against the PC's in your game :)

LeeCHeSSS
22nd of November, 2002, 19:47
If I would actually encounter such a problem in a face to face game I would do the same as PaVel...: I would search the web for the solution.

PaVel
22nd of November, 2002, 21:43
took me long enough though....

Well actually my mom solved it. not a lie!
took her an hour or two

SponkleofInfini
22nd of November, 2002, 21:55
Give her a pat on the back