this is for my stats class and i dont have a calc book with me... the sum of 1/(3^x) where x is from 1 to infinity thanks
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what do a and r represent, and why are they both 1/3 in this case? thanks
a is the first term of the series, and r is the common ratio (the ratio between consecutive terms).
This is a geometric series so you use the formula plato gave to find the sum
ok what if the ratio is 5x/6, is there another formula i can use? this is for solving the sum of: x * (1/6) * (5/6)^(x-1) where x is 1 to infinity
Originally Posted by Plato does a = x*(1/6) then? that wont work because then the answer still has an x in it.
Originally Posted by Dubulus ok what if the ratio is 5x/6, is there another formula i can use? this is for solving the sum of: x * (1/6) * (5/6)^(x-1) where x is 1 to infinity To be honest, I cannot say that I really follow what you are trying to do. Here is an example:
Originally Posted by Dubulus ok what if the ratio is 5x/6, is there another formula i can use? this is for solving the sum of: x * (1/6) * (5/6)^(x-1) where x is 1 to infinity The correct formula for this particular sum is .
Originally Posted by icemanfan The correct formula for this particular sum is . my problem is that there is an "x" in the sum. this to me means that each new factor in the series isn't changing by a constant ratio.
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