View Full Version : "fun" little problem

BigRedRod

13th of November, 2002, 22:39

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, 22:45

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, 22:50

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, 22:52

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, 22:54

no

no you can't

and i'm told there is only a single solution

LeeCHeSSS

14th of November, 2002, 03:44

(6-4+3)^2-1

5^2-1

25-1

24

BigRedRod

14th of November, 2002, 04:16

nope that uses a 2

LeeCHeSSS

14th of November, 2002, 05:22

It doesn't, it's merely a way to write down the multiplication...

Maeko

14th of November, 2002, 05:24

Ah, you mean 'five to the second power'...

BigRedRod

14th of November, 2002, 06:10

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, 07:44

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, 10:49

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, 18:27

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, 18:45

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, 04:58

solved it

3*6 = 18

+1 = 19

+5 = 24

no tricks involved

Gralhruk

15th of November, 2002, 05:11

That's good except where'd you get the "5" from?

The numbers in the problem are 1346.

BigRedRod

15th of November, 2002, 05:28

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, 12:51

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, 13:11

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, 20:05

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, 07:59

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, 19:35

Any word yet weither it was meant to be a 4 or a 5?

LeeCHeSSS

20th of November, 2002, 21:06

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, 22:04

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, 22:51

e-mail away :)

SponkleofInfini

20th of November, 2002, 23:33

look what you have done to us BRR.............we are hanging on for the damn answer :)

itches

21st of November, 2002, 00:49

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, 05:20

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, 07:38

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, 11:49

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, 12:34

6 / (1 - (3 / 4)) this should do it

SponkleofInfini

21st of November, 2002, 17:05

Well what do you know, he has done it :)

BigRedRod

21st of November, 2002, 18:27

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, 22:54

Bah, never was used to dividing by fractions...

PaVel

22nd of November, 2002, 00:34

use only 3 4 7 & 8

result 10

Same rules apply

SponkleofInfini

22nd of November, 2002, 08:42

Arghhhh not another one, and just when I thought this site was about role-playing games :)

The_Friendly_Fiend

22nd of November, 2002, 13:40

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, 14:08

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, 20:47

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, 22:43

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, 22:55

Give her a pat on the back

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