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|dw:1339363260817:dw|

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your answers are not correct

yeah I just realized that

yes - the equation I ended up with agrees with the values found by mahmit2012

I can let you know what equation I found if you want - or do you want to try it yourself first?

I know the answer, it's tn= ((n+1)(n+2))/2 but I don't know how to get to it

I haven't done problems like this before but found that document and followed it to get the answer

I actually got:\[t_n=80(\frac{1}{2})^n+2(n-1)\]

your formula does not produce the right answers

take n=1 - it produces the value 3

yeah I just checked, you're right it gave me the wrong answer.

if you use the formula I derived then it matches all the values (listed by mahmit2012)

I can try and explain the steps I took to derive this

okay, thanks that would be good

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hope it all makes sense?

thanks a lot guys :)

yw :)