| Author |
Topic:
6÷2(1+2)= 1 or 9 ? [Locked] |
Phlegm573  Posts: 528
Registered: 2002-6-12 17:43:34
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Ok let's settle this once and for all by asking Hitler.
Hitler! What is 6÷2(1+2)???
ok... you only had to say it once tho...
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Abaddon_Ambrosius  Title: Retired Theurgist TL
Posts: 1,674
Registered: 2001-12-21 09:51:39
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
I got 1, using the ancient Please My Dear Aunt Sally method.
But then again, I don't know the "definitive" source to verify whether I'm right, or if I've hosed it somewhere.
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Cawlin Posts: 1,759
Registered: 2005-2-22 07:58:42
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Abaddon_Ambrosius posted:
I got 1, using the ancient Please My Dear Aunt Sally method.
But then again, I don't know the "definitive" source to verify whether I'm right, or if I've hosed it somewhere.
You've hosed it slightly. Multiplication and Division are equivalent in the order of operations and so, get handled left to right, as do addition and subtraction... so it could as easily be PEMDAS as PEDMSA or PEDMAS or PEMDSA...
6/2(1+2) =
Parentheses first:
6/2(3) <-- same as saying 6/2*3 - here the parentheses become shorthand for multiplication (which is part of the flaw of this particular problem - the choice to use ambiguous notation as parentheses are usually used with variables when not used to define order of operations)
Exponents next (no exponents)
Then divide and multiply next - going left to right, we have to divide first so it becomes 3 * 3 or 9.
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Abaddon_Ambrosius Title: Retired Theurgist TL
Posts: 1,674
Registered: 2001-12-21 09:51:39
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
By the way, does anyone under 50 remember PMDAS and how it works? Or do I actually need to show it?
Bottom line... the whole 'implied multiplication' goes away because you are supposed to do WHATEVER is in the parens first. Then you move down the order of ops. That makes this particular problem easy.
...assuming, again, that I'm not missing something astoundingly obvious.
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In the immortal words of Socrates - "I drank what?"
"God you guys suck at the internet - how can you fail to locate porn?!" - Eternal_Midnight
"Knowing means nothing." - Fat-badger
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Cawlin Posts: 1,759
Registered: 2005-2-22 07:58:42
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
I'm 42 lol, read above!
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If ignorance were painful, half the posters here would be on morphine drips.
Everyone playing WoW knows everything about playing two classes: 1) their own and 2) Hunters
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Rikarus  Title: Ultimate Badass
Posts: 267
Registered: 2002-2-24 12:24:32
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
.999999~= 1.0
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Abaddon_Ambrosius Title: Retired Theurgist TL
Posts: 1,674
Registered: 2001-12-21 09:51:39
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
OK, well, I'm probably wrong but this is the rudimentary method I was taught:
ooo = PMDAS
6÷2(1+2)
6÷2(3)
6÷6
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1
I thought when you did order of ops and you had equivalent operations, you went from right to left. Might be where I've screwed up. Or gotten it right. Who knows. I never got past basic stats and I let employees do this for me, the last decade or so. lol
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In the immortal words of Socrates - "I drank what?"
"God you guys suck at the internet - how can you fail to locate porn?!" - Eternal_Midnight
"Knowing means nothing." - Fat-badger
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Yukishiro1 Posts: 3,243
Registered: 2002-9-20 23:52:57
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Cawlin posted:
Then divide and multiply next - going left to right, we have to divide first so it becomes 3 * 3 or 9.
It depends how you interpret the division sign and what's in the denominator vs numerator.
It's just ambiguous. Which is why they teach you never to use notation like that.
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Rikarus Title: Ultimate Badass
Posts: 267
Registered: 2002-2-24 12:24:32
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Abaddon_Ambrosius posted:
OK, well, I'm probably wrong but this is the rudimentary method I was taught:
ooo = PMDAS
6÷2(1+2)
6÷2(3)
6÷6
---
1
I thought when you did order of ops and you had equivalent operations, you went from right to left. Might be where I've screwed up. Or gotten it right. Who knows. I never got past basic stats and I let employees do this for me, the last decade or so. lol
No you have done it correctly, sadly math is no longer tuaght in our shcools.....they just have guess tables!
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"But we are all that way: when we know a thing we have only scorn for other people who don't happen to know it." Clemmens
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"Skinny would let his fists do the fisting." RonMexico
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"/Pwning is serious business" Illy
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Cawlin Posts: 1,759
Registered: 2005-2-22 07:58:42
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Date Posted:
1/1/00 12:00am
Subject:
6÷2(1+2)= 1 or 9 ? |
Yukishiro1 posted:
Cawlin posted:
Then divide and multiply next - going left to right, we have to divide first so it becomes 3 * 3 or 9.
It depends how you interpret the division sign and what's in the denominator vs numerator.
It's just ambiguous. Which is why they teach you never to use notation like that.
Denominator and numerator have nothing to do with it.
The ambiguity is that people see the parentheses and assume that it must be handled first even though there is no operation left to do INSIDE those parentheses... and in this case, after you've added 1 and 2, there isn't and the parentheses becomes shorthand for multiplication which people who've taken algebra are familiar with.
6/2*3 = ?
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If ignorance were painful, half the posters here would be on morphine drips.
Everyone playing WoW knows everything about playing two classes: 1) their own and 2) Hunters
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