09-24-2005, 12:01 PM | #261 | |
Elf Lord
Join Date: Jan 2002
Location: Israel
Posts: 6,975
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And it's basically just like the other one isn't it? |
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09-24-2005, 06:46 PM | #262 |
Fenway Ranger, Lord of Red Sox Nation
Join Date: Aug 2005
Location: College!
Posts: 1,976
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Correcto
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Adventure...betrayal...heroism... Atharon: where heroes are born. My wife once said to me—when I'd been writing for ten or fifteen years—that I could always go back to being a nuclear engineer. And I said to her, 'Harriet, would you let someone who quit his job to go write fantasy anywhere near your nuclear reactor? I wouldn't!' (Robert Jordan) |
09-24-2005, 09:15 PM | #263 |
Hobbit in the Music
Join Date: Nov 1999
Location: Westmarch
Posts: 1,111
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Ok, how many gifts did I get from my true love on all 12 days of Christmas?
On the first day, I got one partridge in a pear tree (one gift, even though there's a partridge and a pear tree) On the second day, I got two turtledoves and another partridge in a pear tree (three gifts) On the third day, I got three french hens, two more turtletoves, and one more partridge (six gifts). Oh, sure it's easy to add them up, but can you give me a formula for the number of gifts if n is the number of days that this pattern continues? Then if you want another challenge, find out how many gifts it is if you count the partridge and the pear tree separately, along with the eggs the geese are laying, the drums the drummers are drumming, the cows the maids are milking, etc. Last edited by Elanor : 09-24-2005 at 09:16 PM. |
09-24-2005, 09:17 PM | #264 | |
Fenway Ranger, Lord of Red Sox Nation
Join Date: Aug 2005
Location: College!
Posts: 1,976
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Adventure...betrayal...heroism... Atharon: where heroes are born. My wife once said to me—when I'd been writing for ten or fifteen years—that I could always go back to being a nuclear engineer. And I said to her, 'Harriet, would you let someone who quit his job to go write fantasy anywhere near your nuclear reactor? I wouldn't!' (Robert Jordan) |
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09-24-2005, 09:25 PM | #265 | |
Word Santa Claus
Join Date: Feb 2004
Location: Chicago, IL
Posts: 2,922
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Sufficient to have stood, yet free to fall. Last edited by Count Comfect : 09-24-2005 at 09:29 PM. |
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09-24-2005, 09:30 PM | #266 |
Fenway Ranger, Lord of Red Sox Nation
Join Date: Aug 2005
Location: College!
Posts: 1,976
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Darn...I forgot about using sigma.
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Adventure...betrayal...heroism... Atharon: where heroes are born. My wife once said to me—when I'd been writing for ten or fifteen years—that I could always go back to being a nuclear engineer. And I said to her, 'Harriet, would you let someone who quit his job to go write fantasy anywhere near your nuclear reactor? I wouldn't!' (Robert Jordan) |
09-24-2005, 11:45 PM | #267 | |
Elven Warrior
Join Date: Sep 2005
Posts: 359
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I'm not sure I understand the question completely...you want how many presents you would have after 12 days?
so the series would go 1+2+4+5+6+....right? this doesn't match up with Count Comfect answer though, but i can't figure out what I'm doing wrong,,,, this is the only way I know to do it ok you'll have to bear with me here, everything in red should be in Subscript (ya I know it looks kinda weird) the formula to use is
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09-25-2005, 12:46 AM | #268 | |
Hobbit in the Music
Join Date: Nov 1999
Location: Westmarch
Posts: 1,111
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Count Comfect got it. Another formula is
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09-25-2005, 12:50 AM | #269 | ||
Elven Warrior
Join Date: Sep 2005
Posts: 359
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Quote:
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09-25-2005, 12:54 AM | #270 |
Hobbit in the Music
Join Date: Nov 1999
Location: Westmarch
Posts: 1,111
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Oh, you just did the 12th day. I (hypothetically) got 1+2+...+12 presents on the 12th day, 1+2+...+11 presents on the 11th day, etc.
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09-25-2005, 01:01 AM | #271 |
Elven Warrior
Join Date: Sep 2005
Posts: 359
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Wasn't that the point though...? calculate how many presents you would have on the 12th day? am I missing something?
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09-25-2005, 01:04 AM | #272 |
Word Santa Claus
Join Date: Feb 2004
Location: Chicago, IL
Posts: 2,922
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Total presents by the twelfth day, not presents received on Just the twelfth day.
You got the latter.
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Sufficient to have stood, yet free to fall. |
10-07-2005, 09:06 PM | #273 |
Hobbit in the Music
Join Date: Nov 1999
Location: Westmarch
Posts: 1,111
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Does anyone know anything about computational theory? Automata, regular/context-free languages, etc? I'm frustrated with it.
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01-07-2006, 03:31 PM | #274 |
Join Date: Nov 2003
Location: Narnia
Posts: 1,656
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Theory of comp? (shudders) My brother recently took that course for his masters degree...I think it was the hardest course he took up to that point.
There isn't a physics thread, and I'm not going to start one. I'll post my question here. I have to do a 5-10 page physics research paper (+ model/poster/etc.) I need a topic. My dad first jokingly suggested String Theory; but seriously said semiconductors or radio. Any ideas on something particularly fascinating and not too difficult to understand? (It needs to be pretty focused, too).
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Mike nodded. A sombre nod. The nod Napoleon might have given if somebody had met him in 1812 and said, "So, you're back from Moscow, eh?". Interested in C.S. Lewis? Visit the forum dedicated to one of Tolkien's greatest contemporaries. |
01-07-2006, 04:07 PM | #275 |
The Blobbit
Join Date: Feb 2004
Location: Kent, England (Not Oxford! ... yet...)
Posts: 1,596
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Well you don't get help off Janny without posing a math(s) problem first. Perhaps a study into if becoming a physicist is a cause of baldness or if it's only an unrelated but strong correlation. [/mathematician]
I always found quantum physics quite interesting. I don't know quite how far you can get into it, but there is certainly a wealth of information about particles and I'm sure you can go into what determines whether a reation is allowed or not. It's pretty interesting and also really quite fundamental. Now gimme a maths problem!
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Janny's Songs Janny's lyrics and random photographs Tradition means giving votes to the most obscure of all classes, our ancestors. It is the democracy of the dead. Tradition refuses to submit to the small and arrogant oligarchy of those who happen to be walking about. ~ Mercutio... erm, GK Chesterton. |
01-07-2006, 06:24 PM | #276 |
Join Date: Nov 2003
Location: Narnia
Posts: 1,656
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Hmmm.
Right now in calculus we are studying inverse functions - about to get to differentiating/integrating exponential functions. A question? I'll actually be at a math team meet this Monday, and if I remember the questions (or bring home an extra copy of some) I'll post them here for all to enjoy
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Mike nodded. A sombre nod. The nod Napoleon might have given if somebody had met him in 1812 and said, "So, you're back from Moscow, eh?". Interested in C.S. Lewis? Visit the forum dedicated to one of Tolkien's greatest contemporaries. |
01-07-2006, 06:27 PM | #277 |
The Blobbit
Join Date: Feb 2004
Location: Kent, England (Not Oxford! ... yet...)
Posts: 1,596
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Hooray for competative maths!
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Janny's Songs Janny's lyrics and random photographs Tradition means giving votes to the most obscure of all classes, our ancestors. It is the democracy of the dead. Tradition refuses to submit to the small and arrogant oligarchy of those who happen to be walking about. ~ Mercutio... erm, GK Chesterton. |
01-09-2006, 11:29 PM | #278 |
Join Date: Nov 2003
Location: Narnia
Posts: 1,656
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Without calculator:
Simplify squareroot(5 + squareroot(21)) - square root(5 - squareroot(21)) If f(x) = x^2 + 7x + k and f(k) = -16 find f(6) A triangle with sides 4, 13, 15. Find the tangent of the angle between sides 4 and 15. (A picture would help.....but I can't do one easily). [Draw a short horizontal line (4). On the left endpoint, add a longish (13) line that makes an obtuse angle. Complete triangle with longest (15) line.] A concave pentagon. No interior angles are congruent. The smallest angle is 38 degrees. Except the smallest and biggest, each angle is the average of the two other angles nearest to it. Find the biggest angle. 3^(2x^2 -7x +3) = 4^(x^2 -x -6) Find the rational value for x. With calculator: A wedding cake has five graduated circular tiers, each 8 cm high. The tiers have diameters 10 cm, 20 cm, 30 cm, 40 cm, and 50 cm. What is the surface area to be frosted? There is no frosting between layers. Express your answer in terms of pi. If x^2 + 1/(x^2) and x is greater than 0, find x^5 + 1/(x^5)
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Mike nodded. A sombre nod. The nod Napoleon might have given if somebody had met him in 1812 and said, "So, you're back from Moscow, eh?". Interested in C.S. Lewis? Visit the forum dedicated to one of Tolkien's greatest contemporaries. |
01-10-2006, 12:45 PM | #279 | ||
The Blobbit
Join Date: Feb 2004
Location: Kent, England (Not Oxford! ... yet...)
Posts: 1,596
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Quote:
Must... rational... self. Thanks
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Janny's Songs Janny's lyrics and random photographs Tradition means giving votes to the most obscure of all classes, our ancestors. It is the democracy of the dead. Tradition refuses to submit to the small and arrogant oligarchy of those who happen to be walking about. ~ Mercutio... erm, GK Chesterton. |
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01-10-2006, 02:36 PM | #280 | ||
Word Santa Claus
Join Date: Feb 2004
Location: Chicago, IL
Posts: 2,922
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With calculator:
A wedding cake has five graduated circular tiers, each 8 cm high. The tiers have diameters 10 cm, 20 cm, 30 cm, 40 cm, and 50 cm. What is the surface area to be frosted? There is no frosting between layers. Express your answer in terms of pi. Well...
Alternatively,
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