81, 54, 36, 24...

[thirtythree]

16, but couldn't 15 work?

81 - 27 = 54 - (27 - 9 = 18) = 36 - (18 - 6 = 12) = 24 - (12 - 3) = 15

does that make sense?

 

[Jhill]

uhhhhhh i'll have the #3 combo

 

[faenix]

What kind of twisted math is this?

 

[Shockwave]

Originally posted by: Jhill
uhhhhhh i'll have the #3 combo

I'd like mine supersized please

 

[thirtythree]

 

[bootymac]

Originally posted by: Shockwave

Originally posted by: Jhill
uhhhhhh i'll have the #3 combo

I'd like mine supersized please

with fries

 

[Metalloid]

Originally posted by: thirtythree
16, but couldn't 15 work?

81 - 27 = 54 - (27 - 9 = 18) = 36 - (18 - 6 = 12) = 24 - (12 - 3) = 15

does that make sense?

12/3 = 4

24 - 8 = 16

 

[FrustratedUser]

I'll take a coke please.

 

[thirtythree]

Originally posted by: Metalloid

Originally posted by: thirtythree
16, but couldn't 15 work?

81 - 27 = 54 - (27 - 9 = 18) = 36 - (18 - 6 = 12) = 24 - (12 - 3) = 15

does that make sense?

12/3 = 4

24 - 8 = 16

I'm not sure what you're talking about... you get 16 by just multiplying each number by 2/3. also, I'm not dividing 12 by 3 anywhere.

 

[Syringer]

He's talking about the second to last step..where you do 12-3. Should be 12-4.

 

[Kev]

i guess you could do it your way, but i dont consider -27 -18 -12 an actual pattern

 

[thirtythree]

Originally posted by: Syringer
He's talking about the second to last step..where you do 12-3. Should be 12-4.

oh, I see what you mean. I'm not dividing 12 by three though. the subtraction from the previous subtraction is decreasing by three each time.

 

[Goosemaster]

Assuming you are multiplying the a_n-1_ term by 2/3, the nthe last answer is 16

The series you have ther is different


I Still don't understand what you did there...the powers of values of 3 are inconsistent

 

[Frosty3799]

Originally posted by: thirtythree

Originally posted by: Syringer
He's talking about the second to last step..where you do 12-3. Should be 12-4.

oh, I see what you mean. I'm not dividing 12 by three though. the subtraction from the previous subtraction is decreasing by three each time.

It just happens to work out that the first three are like that, you sure you aren't supposed to divide it by 3?

 

[hdeck]

Originally posted by: bootymac

Originally posted by: Shockwave

Originally posted by: Jhill
uhhhhhh i'll have the #3 combo

I'd like mine supersized please

with fries

combos come with fries already

 

[Goosemaster]

SeYOur problem is youaare trying to compare two different series.

The 15 DOES apply to the one in your post.

If you were to give the series in your topic to anyone, they would tell you it is a _n-1_ * 2/3

 

[thirtythree]

okay, my head hurts

what I'm doing is decreasing the previous subtraction by 9 then 6 then 3, but I guess you can't reference the previous subtraction in a series anyway.

 

[EvanGeliSt]

double combo with melts

 

[opticalmace]

Originally posted by: thirtythree
okay, my head hurts

what I'm doing is decreasing the previous subtraction by 9 then 6 then 3, but I guess you can't reference the previous subtraction in a series anyway.

yeah, and your way isn't nearly as slick/simple as straight division

i noticed that at first too, in fact.

 

[Goosemaster]

Originally posted by: opticalmace

Originally posted by: thirtythree
okay, my head hurts

what I'm doing is decreasing the previous subtraction by 9 then 6 then 3, but I guess you can't reference the previous subtraction in a series anyway.

yeah, and your way isn't nearly as slick/simple as straight division

i noticed that at first too, in fact.

Actually you can refreence the previous term, but it has to be written recursively, such as I wrote it.


The whole point is that it would HELP if we a a sigma and some limits. As it stands, both series(the one in the topic and the one in the post) are possible, but they are 2 DISTINCT and different series.


2..4....8.......


It could be

2 ^n or 2(a_n-1_)


THe problem is that people suck at math and leave out the most critical pieces on information.


In conclusion, both series work out to 16 and 15, respectively, but that just shows that you need to study more.

 

[GhettoFob]

 

[Kenji4861]

81 - 27 = 54
54 - 27 - 9 = 18
18 - 9 - 3 = 6
6 - 3 - 1 = 2

that would've made better sense.

 

[Crusty]

3i+2=µ

 

[Sid59]

killer combo!

 

[thirtythree]

Originally posted by: Kenji4861
81 - 27 = 54
54 - 27 - 9 = 18
18 - 9 - 3 = 6
6 - 3 - 1 = 2

that would've made better sense.

that would've made better sense if the numbers were 81, 54, 18, and 6, but they weren't.