Mathamania discussion

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Random Numbers

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message 1: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2028, 4056, 8112, 16224, 32448, 64896...

What pattern in this?


message 2: by Gabby (new)

Gabby R. | 11 comments Doubling. The next number is 129792.


message 3: by Joon, Math genius (new)

Joon (JoonChang) | 67 comments Mod
Correct.

3.141592635...
What are the next 10 digits?


message 4: by Gabby (new)

Gabby R. | 11 comments I hate pi!!

8979323846


message 5: by Nicolle (new)

Nicolle | 43 comments ok what is the 1000th number?

9, 36, 81, 144, 225, 324, 441, 576, 729, 900...


message 6: by Elaine (new)

Elaine (caladhiel) 9,000,000!


message 7: by Nicolle (new)

Nicolle | 43 comments wooo!! Do you know the equation?


message 8: by Elaine (new)

Elaine (caladhiel) I didn't before, but I figured it out. Let me see if I can explain it:

You take the place value (first number = 1, second number = 2, etc), multiply it by itself, and then multiply that by 9. Example: 1x1x9=9, 2x2x9=36, 3x3x9=81, etc.

Very neat problem Nicolle!


message 9: by Nicolle (new)

Nicolle | 43 comments lol thats one way but i actually thought multiply the place value by three and square but both work lol.



message 10: by Elaine (last edited Feb 23, 2009 11:39AM) (new)

Elaine (caladhiel) Yep, both work! LOL! It's funny how people see things differently.

Here's one:

...17, 31, 59, 155, 227,...

What's the next number?


message 11: by Nicolle (new)

Nicolle | 43 comments hmmm......


message 12: by Elaine (new)

Elaine (caladhiel) Anyone?


message 13: by Jin (new)

Jin | 22 comments i am thinking.........


message 14: by Jin (new)

Jin | 22 comments i think you might have typo. isn't 155 suppose to be 115?? If it is 115, then the answer is 451.


message 15: by Jin (new)

Jin | 22 comments try this one.

1
1 1
1 2
1 1 2 1
1 2 2 1 1 1
1 1 2 2 1 3
1 2 2 2 1 1 3 1
1 1 2 3 1 2 3 1 1 1


what's the next set of numbers?



message 16: by Jin (new)

Jin | 22 comments oppppppppppps that one was on the other discussion already


1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233

next number???it should be easy


message 17: by Elaine (new)

Elaine (caladhiel) Jin wrote: "i think you might have typo. isn't 155 suppose to be 115?? If it is 115, then the answer is 451. "


Yes! Good job and sorry about the typo!!!



message 18: by Elaine (new)

Elaine (caladhiel) Jin wrote: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233

next number???it should be easy



The next number is 377!


message 19: by Jin (new)

Jin | 22 comments yay!!!!!


message 20: by Ashley (last edited May 17, 2010 08:57PM) (new)

Ashley Do you all know about Pascal's triangle? It is pretty fun to do when you are bored and have quite a bit of extra paper sitting around if you are serious about it! It goes like this:

1
1,1
1,2,1
1,3,3,1
1,4,6,4,1
1,5,10,10,5,1
1,6,15,20,15,6,1
1,7,21,35,35,21,7,1
1,8,28,56,70,56,28,7,1
1,9,36,84,126,126,84,36,9,1
1,10,45,120,210,252,210,120,45,10,1

It's a pretty simple concept! It works better if you have it in an actual pyramid formation to line up the numbers better.


message 21: by Adam (new)

Adam There's an easier way to find those coefficients without Pascal's triangle by using permutation notation. With an n choose k, type of concept.


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