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|dw:1439420130504:dw|

So how would I plug this in?

Help ! haha please good person @ganeshie8

triciaal seems to be having the right method - i think you just need to add up the first 10 terms

remember the "partial sum formula" for geometric series ?

yes i do

\[\large S_n=a_1*\dfrac{1-r^n}{1-r}\]
does it look something like above in ur notes ?

yes. but there is the sigma thing in the front

\[\large \sum\limits_{i=1}^na_i=a_1*\dfrac{1-r^n}{1-r}\]
like that ?

yes

ok one sec

No wait, there is a mistake

ok

scratch that, il type it again fixing the mistake

ok thanks

yes thank you

let me know what you get and please medal triciaal, not me

I got 149

Wow! 149 ?
She cannot receive 149 points back! double check ur work

oh sorry put it in way wrong haha

let me do it over

take your time..

wait yea i got 149 again lol

lets check with wolfram

ok

http://www.wolframalpha.com/input/?i=10.5*%281-%283%2F10%29%5E10%29%2F%281-3%2F10%29

ahh ok

but doesn't the sigma change it to 149

why ?

what do you know about sigma

like when u account for sigma in the problem.

what do you mean by that, could you elaborate

yea you have to take in to account the numbers above the sigma

idk maybe I'm crazy haha

\(\sum\) is just a short cut for "sum of terms"
don't let that confuse you here

check this quick
http://www.mathsisfun.com/algebra/sigma-notation.html

ohh thanks so much

15 points !

ah. so it would just be 14.999

thanks again