SOLUTION: use summation notation to write the series: 1- 1/2+ 1/4- 1/8+ ...- 1/128

Question 347947: use summation notation to write the series: 1- 1/2+ 1/4- 1/8+ ...- 1/128
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
note where is the first term and n the common ratio. In this series the common ratio is r = -(1/2)
.
knowing the value of the nth term: find the number of terms in the series

6 = n-1
7 =n
.
finding the sum of the terms can be found by the following

substitute:

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