Help needed! Any maths whizzes available please?

Found 18th Nov 2009
I have a very confusing question. I need fixed sequence for the following numbers:

4 0.25 4 0.25 ......

The question is, how do i get from 4 to 0.25 bck to 4 nd then 0.25. I hve tried dividing by 16 nd multiplying by 16 which is wrong becuse it hs to be just one thing e.g either divde, subtrct, multiply or add. I hve not got an idea. Please help someone!

22 Comments

subtract 3.75, then add 3.75, then subtract again :? tht was easy

not sure myself but ive a few spare a's if you want them :thumbsup:

Original Poster

micoo;6933715

subtract 3.75, then add 3.75, then subtract again :? tht was easy




It cn't be subtrct, then add. Has to be a fixed sequence. Thnk u for trying

rumela;6933733

It cn't be subtrct, then add. Has to be a fixed sequence. Thnk u for … It cn't be subtrct, then add. Has to be a fixed sequence. Thnk u for trying



o right i see wht u mean nw lol :lol:

Original Poster

richp;6933722

not sure myself but ive a few spare a's if you want them :thumbsup:



Yes please! :thumbsup:

mebbe check out that it's 4/1 and 1/4?

Each term is the inverse of it's predecessor.

Term n = 1/(term n-1)

Admittedly copied from google!

scottygar;6933753

mebbe check out that it's 4/1 and 1/4?



i was thinking that but it doesnt really fit cos your not dividing by the same thing

Original Poster

cosmicdav3;6933759

Each term is the inverse of it's predecessor. Term n = 1/(term … Each term is the inverse of it's predecessor. Term n = 1/(term n-1)Admittedly copied from google!




What does that mean?:?

its (4)^(-1)^n
as n increases it is either 1/4 or 4. I guess its something like that

Cosmicdav3 looks about right as well.

rumela;6933770

What does that mean?:?



1/(1/4) = 4/1

1/(4/1) = 1/4


basically 1/previous answer..

Original Poster

Artonox;6933780

its (4)^(-1)^nas n increases it is either 1/4 or 4. I guess its something … its (4)^(-1)^nas n increases it is either 1/4 or 4. I guess its something like thatCosmicdav3 looks about right as well.



This does give the answer 0.25 but does not go bck to 4 again. n can't change, it is constant.:oops:

Original Poster

scottygar;6933787

1/(1/4) = 4/11/(4/1) = 1/4



Its not constant

well if n=1 then its 4^(-1)=0.25
if n=2 then its 4^1 = 4
if n=3 then its 4^(-1) = 0.25 and so on
im not sure what you mean by n is a constant, i define n as the term in the sequence
so in this case the first term (when n=1) is 0.25, 2nd (when n =2) is 4 and so on.

oh and by the way, if you want to find the next time from the previous term, then you just take cosmicdavs or scottygars advice.

rumela;6933818

Its not constant



it doesnt need to be... i was just showing you how it would work... the sequence is 1 divided by the previous number in the sequence..

Original Poster

Artonox;6933825

well if n=1 then its 4^(-1)=0.25if n=2 then its 4^1 = 4if n=3 then its … well if n=1 then its 4^(-1)=0.25if n=2 then its 4^1 = 4if n=3 then its 4^(-1) = 0.25 and so onim not sure what you mean by n is a constant, i define n as the term in the sequenceso in this case the first term (when n=1) is 0.25, 2nd (when n =2) is 4 and so on.



Well done! I think you have cracked it. :thumbsup:

1 divided by 4 = 0.25. 0.25 divided by 1 = 0.25.

The Therapist;6933855

1 divided by 4 = 0.25. 0.25 divided by 1 = 0.25.



1 divided by 0.25 = 4 ;-)

Artonox;6933825

well if n=1 then its 4^(-1)=0.25if n=2 then its 4^1 = 4if n=3 then its … well if n=1 then its 4^(-1)=0.25if n=2 then its 4^1 = 4if n=3 then its 4^(-1) = 0.25 and so onim not sure what you mean by n is a constant, i define n as the term in the sequenceso in this case the first term (when n=1) is 0.25, 2nd (when n =2) is 4 and so on.



Yeah! Impressive!

lol ty. But i must say, im no genius... im stayin up late to try and at least get something done for my uni coursework thats due in tomorrow hehehe. gonna get back to it.

could it be:
4 - 3.75
& then
-(-3.75) to get back to 4

still using constant minus........ just my tuppennce worth mate
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