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  #1  
Unread 13th of November, 2002, 22:39
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Angry "fun" little problem

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
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Unread 13th of November, 2002, 22:45
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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.
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Unread 13th of November, 2002, 22:50
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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
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Unread 13th of November, 2002, 22:52
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Next question, can i arrange them to form new numbers?

as in putting 1 and 3 next to each other to get 13
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Unread 13th of November, 2002, 22:54
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no
no you can't


and i'm told there is only a single solution
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Unread 14th of November, 2002, 03:44
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(6-4+3)^2-1
5^2-1
25-1
24
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Unread 14th of November, 2002, 04:16
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nope that uses a 2
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Unread 14th of November, 2002, 05:22
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It doesn't, it's merely a way to write down the multiplication...
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Unread 14th of November, 2002, 05:24
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Ah, you mean 'five to the second power'...
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Unread 14th of November, 2002, 06:10
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ack
yeah it either uses a 2
or a number twice

there are two ways to write it
but still you are wrong
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Unread 14th of November, 2002, 07:44
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I don't care what you say, I feel smart for at least coming up with a way
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Unread 14th of November, 2002, 10:49
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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.
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Unread 14th of November, 2002, 18:27
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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
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Unread 14th of November, 2002, 18:45
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I'm taking leechesss stance.

i worked out how to get it to Zero. So i feel smart for that.
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Unread 15th of November, 2002, 04:58
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solved it

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

no tricks involved
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Unread 15th of November, 2002, 05:11
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That's good except where'd you get the "5" from?

The numbers in the problem are 1346.
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Unread 15th of November, 2002, 05:28
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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
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Unread 15th of November, 2002, 12:51
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Let me guess, your three was the key to solving the problem since "Three is a magic number!"

"Hey Rocky, watch me pull a five out of my hat. Presto! Whoa! I better get me a new hat."
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Unread 15th of November, 2002, 13:11
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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
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Unread 15th of November, 2002, 20:05
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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?
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Unread 16th of November, 2002, 07:59
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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!
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Unread 20th of November, 2002, 19:35
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Any word yet weither it was meant to be a 4 or a 5?
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Unread 20th of November, 2002, 21:06
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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
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Unread 20th of November, 2002, 22:04
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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
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Unread 20th of November, 2002, 22:51
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e-mail away
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