• We’re currently investigating an issue related to the forum theme and styling that is impacting page layout and visual formatting. The problem has been identified, and we are actively working on a resolution. There is no impact to user data or functionality, this is strictly a front-end display issue. We’ll post an update once the fix has been deployed. Thanks for your patience while we get this sorted.

81, 54, 36, 24...

T

thirtythree

Diamond Member
16, but couldn't 15 work?

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

does that make sense? 😕
 
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? 😕
Click to expand...

12/3 = 4

24 - 8 = 16
Click to expand...
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.
 
Originally posted by: Syringer
He's talking about the second to last step..where you do 12-3. Should be 12-4.
Click to expand...
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.
 
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










 
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.
Click to expand...
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.
Click to expand...

It just happens to work out that the first three are like that, you sure you aren't supposed to divide it by 3?
 
Originally posted by: bootymac
Originally posted by: Shockwave
Originally posted by: Jhill
uhhhhhh i'll have the #3 combo
Click to expand...

I'd like mine supersized please
Click to expand...

with fries
Click to expand...

combos come with fries already
rolleye.gif
 
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

 
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.
 
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.
Click to expand...
yeah, and your way isn't nearly as slick/simple as straight division

i noticed that at first too, in fact.
 
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.
Click to expand...
yeah, and your way isn't nearly as slick/simple as straight division

i noticed that at first too, in fact.
Click to expand...

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.
 
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.
Click to expand...
that would've made better sense if the numbers were 81, 54, 18, and 6, but they weren't.
 
You must log in or register to reply here.

TRENDING THREADS

Back
Top